Unable to build

java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

Try:
Run with --stacktrace option to get the stack trace. Run with --info
or --debug option to get more log output.

Get more help at https://help.gradle.org

BUILD FAILED in 10s
40 actionable tasks: 29 executed, 11 up-to-date
Error: /Users/pratik-mac/Desktop/development/ionic/loadlink/platforms/android/gradlew: Command failed with exit code 1 Error output:
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ‘:transformDexArchiveWithExternalLibsDexMergerForDebug’.
java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

Get more help at

BUILD FAILED in 10s

[ERROR] An error occurred while running cordova build android (exit code 1).

Can we see some ionic info details?
Make sure to use latest Cordova version along with compatible local Android platform package.

If I get mentioned error, after checking everything is good, I remove Android platform and plugin folder and then re-add Android platform back. It could be due to miss-matches in installed plugins.

try to clean build your project by gradlew clean.

Try the following steps -

Add cordova-android-support-gradle-release plugin with ionic cordova plugin add cordova-android-support-gradle-release
remove android platform with ionic cordova platform rm android
then build again