Help in building APK with admob-free

when i add ionic admob free plugin i got this error when building the app

cordova build android
Android Studio project detected

ANDROID_HOME=C:\Users\wzcoder\AppData\Local\Android\Sdk
JAVA_HOME=C:\Program Files\java\jdk1.8.0_171
studio
Subproject Path: CordovaLib
Subproject Path: app
[11:25:11] lint finished in 6.93 s
publishNonDefault is deprecated and has no effect anymore. All variants are now published.

The Task.leftShift(Closure) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use Task.doLast(Action) instead.
at build_3gpxlwkptiz63tes07idci8ff.run(C:\Users\wzcoder\Desktop\admo\platforms\android\app\build.gradle:143)
Configuration ‘compile’ in project ‘:app’ is deprecated. Use ‘implementation’ instead.
:CordovaLib:preBuild UP-TO-DATE
:CordovaLib:preDebugBuild UP-TO-DATE
:CordovaLib:compileDebugAidl UP-TO-DATE
:CordovaLib:compileDebugRenderscript
UP-TO-DATE
:CordovaLib:checkDebugManifest

UP-TO-DATE
:CordovaLib:generateDebugBuildConfig UP-TO-DATE
:CordovaLib:prepareLintJar
UP-TO-DATE
:CordovaLib:generateDebugResValues UP-TO-DATE
:CordovaLib:generateDebugResources UP-TO-DATE
:CordovaLib:packageDebugResources
UP-TO-DATE
:CordovaLib:platformAttrExtractor

UP-TO-DATE
:CordovaLib:processDebugManifest

UP-TO-DATE
:CordovaLib:processDebugResources
UP-TO-DATE
:CordovaLib:generateDebugSources UP-TO-DATE
:CordovaLib:javaPreCompileDebug UP-TO-DATE
:CordovaLib:compileDebugJavaWithJavac
UP-TO-DATE

:CordovaLib:processDebugJavaRes NO-SOURCE
:CordovaLib:transformClassesAndResourcesWithPrepareIntermediateJarsForDebug UP-TO-DATE
:app:preBuild
UP-TO-DATE
:app:preDebugBuild
UP-TO-DATE
:app:compileDebugAidl UP-TO-DATE
:CordovaLib:packageDebugRenderscript

NO-SOURCE
:app:compileDebugRenderscript

UP-TO-DATE
:app:checkDebugManifest UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:prepareLintJar UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources
UP-TO-DATE

:app:createDebugCompatibleScreenManifests UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:splitsDiscoveryTaskDebug UP-TO-DATE
:app:processDebugResources

UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:javaPreCompileDebug

UP-TO-DATE
:app:compileDebugJavaWithJavac
C:\Users\wzcoder\Desktop\admo\platforms\android\app\src\main\java\name\ratson\cordova\admob\rewardvideo\RewardVideoListener.java:90: error: method does not override or implement a method from a supertype
@Override
^
Note: Some input files use or override a deprecated API.
FAILED

Note: Recompile with -Xlint:deprecation for details.
1 error

27 actionable tasks: 1 executed, 26 up-to-date
FAILURE: Build failed with an exception.

  • What went wrong:
    Execution failed for task ‘:app:compileDebugJavaWithJavac’.

Compilation failed; see the compiler error output for details.

  • 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 7s
(node:8732) UnhandledPromiseRejectionWarning: Error: cmd: Command failed with exit code 1 Error output:
C:\Users\wzcoder\Desktop\admo\platforms\android\app\src\main\java\name\ratson\cordova\admob\rewardvideo\RewardVideoListener.java:90: error: method does not override or implement a method from a supertype
@Override
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

FAILURE: Build failed with an exception.

  • What went wrong:
    Execution failed for task ‘:app:compileDebugJavaWithJavac’.

Compilation failed; see the compiler error output for details.

  • 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 7s
at ChildProcess.whenDone (C:\Users\wzcoder\Desktop\admo\platforms\android\cordova\node_modules\cordova-common\src\superspawn.js:169:23)
at emitTwo (events.js:126:13)
at ChildProcess.emit (events.js:214:7)
at maybeClose (internal/child_process.js:925:16)
at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
(node:8732) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:8732) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.