Im newbie, and i need help

BlueCheese

i try to export my first app with firebase on android, but the problem i have here:

Task :assetPacks:installTime:clean UP-TO-DATE
Task :preBuild UP-TO-DATE
Task :preDebugBuild UP-TO-DATE
Task :mergeDebugNativeDebugMetadata NO-SOURCE
Task :compileDebugAidl NO-SOURCE
Task :compileDebugRenderscript NO-SOURCE
Task :generateDebugBuildConfig
Task :checkDebugAarMetadata FAILED

FAILURE: Build failed with an exception.

What went wrong:
Execution failed for task ':checkDebugAarMetadata'.

Could not resolve all files for configuration ':debugRuntimeClasspath'.
Could not find com.google.ads.mediation:unity:3.4.2.2.
Searched in the following locations:
- https://dl.google.com/dl/android/maven2/com/google/ads/mediation/unity/3.4.2.2/unity-3.4.2.2.pom
- https://repo.maven.apache.org/maven2/com/google/ads/mediation/unity/3.4.2.2/unity-3.4.2.2.pom
Required by:
project :

Try:

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BUILD FAILED in 11s
4 actionable tasks: 3 executed, 1 up-to-date

I been searching for the solution, but nothing i could do. pls help