I recently added an adview to my app. But dint knew anything about admob. I got an error bcz I didn't link it with admobId. So I deleted the adview from the layout. But the same error came again. I think the adview changed the scource code in many files like gradle, manifest etc. I don't know what changes shoud be undone. Help!
I got the answer.
First of all delete the adview if u haven't.
Secondly delete the metadata in your manifest file
Thirdly open build.gradle(module:app) and delete the implementation 'com.google..........ads:...
It helped me!