"Duplicate class found" error if play-services-ads:21.2.0 is used

I upgraded from Capacitor 3 to 4 using the upgrade guide. I had the same problem like described here:

I had to downgrade play-services-ads:21.2.0 to version 20.4.0 to get it running.

Why do I have to do this, and are there any disadvantages when using the old version?

Thank you!

Have you tried using 21.3.0 instead of 20.4.0?

Looks like a bug on the play-services-ads library, so might have been fixed on latest version

Using version 21.3.0 does not work unfortunately. This is the full error I get in Android Studio:


> Task :app:checkDebugDuplicateClasses FAILED
Execution failed for task ':app:checkDebugDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class com.google.android.gms.internal.measurement.zzhx found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.internal.measurement.zzmz found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.internal.measurement.zzna found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.internal.measurement.zznb found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.internal.measurement.zznc found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.internal.measurement.zznd found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzga found in modules jetified-play-services-measurement-19.0.0-runtime (com.google.android.gms:play-services-measurement:19.0.0) and jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2)
     Duplicate class com.google.android.gms.measurement.internal.zzhe found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzhf found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzhg found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzhh found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzhi found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzhj found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzio found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
     Duplicate class com.google.android.gms.measurement.internal.zzit found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)

* Try:
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:checkDebugDuplicateClasses'.
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:147)
	at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:282)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:145)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:133)
	at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
	at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
	at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:74)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:333)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:320)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:313)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:299)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:143)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:227)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:218)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:140)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
	at org.gradle.workers.internal.DefaultWorkerExecutor$WorkItemExecution.waitForCompletion(DefaultWorkerExecutor.java:339)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.lambda$waitForItemsAndGatherFailures$2(DefaultAsyncWorkTracker.java:131)
	at org.gradle.internal.Factories$1.create(Factories.java:31)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withoutLocks(DefaultWorkerLeaseService.java:341)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withoutLocks(DefaultWorkerLeaseService.java:326)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:127)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:93)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForAll(DefaultAsyncWorkTracker.java:79)
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForCompletion(DefaultAsyncWorkTracker.java:67)
	at org.gradle.api.internal.tasks.execution.TaskExecution$3.run(TaskExecution.java:250)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:47)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:68)
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeAction(TaskExecution.java:227)
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeActions(TaskExecution.java:210)
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeWithPreviousOutputFiles(TaskExecution.java:193)
	at org.gradle.api.internal.tasks.execution.TaskExecution.execute(TaskExecution.java:171)
	at org.gradle.internal.execution.steps.ExecuteStep.executeInternal(ExecuteStep.java:89)
	at org.gradle.internal.execution.steps.ExecuteStep.access$000(ExecuteStep.java:40)
	at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:53)
	at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:50)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
	at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:50)
	at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:40)
	at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:68)
	at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:38)
	at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:48)
	at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:36)
	at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:41)
	at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:74)
	at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:55)
	at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:51)
	at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:29)
	at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:61)
	at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:42)
	at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:60)
	at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:27)
	at org.gradle.internal.execution.steps.BuildCacheStep.executeWithoutCache(BuildCacheStep.java:180)
	at org.gradle.internal.execution.steps.BuildCacheStep.lambda$execute$1(BuildCacheStep.java:75)
	at org.gradle.internal.Either$Right.fold(Either.java:175)
	at org.gradle.internal.execution.caching.CachingState.fold(CachingState.java:59)
	at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:73)
	at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:48)
	at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:36)
	at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:25)
	at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:36)
	at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:22)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:110)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$2(SkipUpToDateStep.java:56)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:56)
	at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:38)
	at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:73)
	at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:44)
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:37)
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:27)
	at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:89)
	at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:50)
	at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:114)
	at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:57)
	at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:76)
	at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:50)
	at org.gradle.internal.execution.steps.SkipEmptyWorkStep.executeWithNoEmptySources(SkipEmptyWorkStep.java:249)
	at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:86)
	at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:54)
	at org.gradle.internal.execution.steps.RemoveUntrackedExecutionStateStep.execute(RemoveUntrackedExecutionStateStep.java:32)
	at org.gradle.internal.execution.steps.RemoveUntrackedExecutionStateStep.execute(RemoveUntrackedExecutionStateStep.java:21)
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38)
	at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:43)
	at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:31)
	at org.gradle.internal.execution.steps.AssignWorkspaceStep.lambda$execute$0(AssignWorkspaceStep.java:40)
	at org.gradle.api.internal.tasks.execution.TaskExecution$4.withWorkspace(TaskExecution.java:287)
	at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:40)
	at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:30)
	at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:37)
	at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:27)
	at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:44)
	at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:33)
	at org.gradle.internal.execution.impl.DefaultExecutionEngine$1.execute(DefaultExecutionEngine.java:76)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:144)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:133)
	at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
	at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
	at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:74)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:333)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:320)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:313)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:299)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:143)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:227)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:218)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:140)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
Caused by: java.lang.RuntimeException: Duplicate class com.google.android.gms.internal.measurement.zzhx found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.internal.measurement.zzmz found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.internal.measurement.zzna found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.internal.measurement.zznb found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.internal.measurement.zznc found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.internal.measurement.zznd found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzga found in modules jetified-play-services-measurement-19.0.0-runtime (com.google.android.gms:play-services-measurement:19.0.0) and jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2)
Duplicate class com.google.android.gms.measurement.internal.zzhe found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzhf found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzhg found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzhh found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzhi found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzhj found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzio found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)
Duplicate class com.google.android.gms.measurement.internal.zzit found in modules jetified-play-services-measurement-base-20.1.2-runtime (com.google.android.gms:play-services-measurement-base:20.1.2) and jetified-play-services-measurement-impl-19.0.0-runtime (com.google.android.gms:play-services-measurement-impl:19.0.0)

Go to the documentation to learn how to Fix dependency resolution errors.
	at com.android.build.gradle.internal.tasks.CheckDuplicateClassesDelegate.run(CheckDuplicateClassesDelegate.kt:65)
	at com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable.execute(CheckDuplicateClassesDelegate.kt:91)
	at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:66)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:62)
	at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:97)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.lambda$execute$0(NoIsolationWorkerFactory.java:62)
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
	at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:59)
	at org.gradle.workers.internal.DefaultWorkerExecutor.lambda$submitWork$2(DefaultWorkerExecutor.java:205)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:187)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.access$700(DefaultConditionalExecutionQueue.java:120)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner$1.run(DefaultConditionalExecutionQueue.java:162)
	at org.gradle.internal.Factories$1.create(Factories.java:31)
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:270)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:119)
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:124)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:157)
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:126)
	... 2 more

.

Any other idea what could cause this?

  • Reinstalled npm packages
  • Recreated Android with cap add android

Still the same duplicate class error. Any idea anybody?

Ok, it works when changings dependencies to

implementation 'com.google.android.gms:play-services-ads:20.4.0'
implementation 'androidx.work:work-runtime:2.7.0'   

I created a issue in Plugin repository: "Duplicate class found" error with play-services-ads:21:2:0 · Issue #195 · capacitor-community/admob · GitHub

Issues in repositories of plugins regarding this issue. It`s a compatibility problem between @capacitor-community/firebase-analytics and capacitor v4