Android Build Error - Interstitial Ads

I’m getting the following error when building.

UATHelper: Packaging (Android (ETC2)): > Task :app:compileReleaseJavaWithJavac FAILED
UATHelper: Packaging (Android (ETC2)): The following annotation processors are not incremental: lifecycle-compiler-2.0.0.jar (androidx.lifecycle:lifecycle-compiler:2.0.0).
UATHelper: Packaging (Android (ETC2)): Make sure all annotation processors are incremental to improve your build speed.
UATHelper: Packaging (Android (ETC2)): Z:\app\src\main\java\com\epicgames\ue4\GameActivity.java:238: error: cannot find symbol
UATHelper: Packaging (Android (ETC2)): import com.google.android.gms.ads.InterstitialAd;
UATHelper: Packaging (Android (ETC2)): ^
UATHelper: Packaging (Android (ETC2)): symbol: class InterstitialAd
UATHelper: Packaging (Android (ETC2)): location: package com.google.android.gms.ads
UATHelper: Packaging (Android (ETC2)): Z:\app\src\main\java\com\epicgames\ue4\GameActivity.java:579: error: cannot find symbol
UATHelper: Packaging (Android (ETC2)): private InterstitialAd interstitialAd;
UATHelper: Packaging (Android (ETC2)): ^
UATHelper: Packaging (Android (ETC2)): > Task :downloader_library:bundleLibRuntimeToJarRelease
UATHelper: Packaging (Android (ETC2)): > Task :permission_library:bundleLibRuntimeToJarRelease
UATHelper: Packaging (Android (ETC2)): symbol: class InterstitialAd
UATHelper: Packaging (Android (ETC2)): location: class GameActivity
UATHelper: Packaging (Android (ETC2)): 2 errors
UATHelper: Packaging (Android (ETC2)): FAILURE: Build failed with an exception.
UATHelper: Packaging (Android (ETC2)): * What went wrong:
UATHelper: Packaging (Android (ETC2)): Execution failed for task ‘:app:compileReleaseJavaWithJavac’.
UATHelper: Packaging (Android (ETC2)): > Compilation failed; see the compiler error output for details.
UATHelper: Packaging (Android (ETC2)): * Try:
UATHelper: Packaging (Android (ETC2)): Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
UATHelper: Packaging (Android (ETC2)): * Get more help at https://help.gradle.org
UATHelper: Packaging (Android (ETC2)): BUILD FAILED in 22s
UATHelper: Packaging (Android (ETC2)): 51 actionable tasks: 51 executed
UATHelper: Packaging (Android (ETC2)): ERROR: cmd.exe failed with args /c “D:\Game Dev\Cube 4.27\Intermediate\Android\gradle\rungradle.bat” :app:bundleRelease
UATHelper: Packaging (Android (ETC2)): (see C:\Users\anton\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Unreal+Engine+Installation+UE_4.27\Log.txt for full exception trace)
UATHelper: Packaging (Android (ETC2)): AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Android (ETC2)): BUILD FAILED
PackagingResults: Error: Unknown Error

I’m using a plugin - AdMob Goodies for my ads but i think this error is not from the plugin

Any idea how to fix this?

There is a free plugin ’ Bansh Ads’ available for integrating various types of ads, including banners, intermediate, and rewarded ads, into Unreal Engine.

Additionally, it allows you to incorporate mediation services such as Unity Ads, Chartboost, Vungle, AdColony, and AppLovin. link → Bansh Ads in Code Plugins - UE Marketplace