google_maps_key

[amarildocs]

Hello, replaces in the place indicated my key api "AIza****************************"
"res/values/google_maps_api.xml"
...name="google_maps_key"> ENTER_API_KEY_HERE

but this returned error:
error: resource string/google_maps_key (aka com.univ.team12.navar:string/google_maps_key) not found.

and also using android studio 3.1.2
Java compiler:
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
WARNING: Configuration 'androidTestCompile' is obsolete and has been replaced with 'androidTestImplementation' and 'androidTestApi'.
WARNING: Configuration 'androidTestApi' is obsolete and has been replaced with 'androidTestImplementation'.
WARNING: Configuration 'provided' is obsolete and has been replaced with 'compileOnly'.
WARNING: Configuration 'testCompile' is obsolete and has been replaced with 'testImplementation' and 'testApi'.
WARNING: Configuration 'testApi' is obsolete and has been replaced with 'testImplementation'.
error: failed processing manifest.

would you kindly check