Error using AdMob

[otacilioricardo]

After making the modifications indicated in the tutorial, the error below occurs.

How do I resolve this issue?

* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Could not find :react-native-admob:.
     Required by:
         project :app

If the indicated changes are not made, the following error occurs:

Requirenativecomponent RNGadBannerview was not found in the UIManager.

How to solve this problem?

Does anyone know another way to place ads in the app?

Thank you for your help.