FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':firebase_admob:verifyReleaseResources'.
> java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
  C:UsersAzhan KhanAndroidStudioProjectssimple_motivationbuildfirebase_admobintermediatesresmergedreleasevaluesvalues.xml:304: error: resource android:attr/fontVariationSetti
ngs not found.
  C:UsersAzhan KhanAndroidStudioProjectssimple_motivationbuildfirebase_admobintermediatesresmergedreleasevaluesvalues.xml:305: error: resource android:attr/ttcIndex not found
.
  error: failed linking references.