[cordova+visual studio] problema con admob

voglio usare Admob nel mio progetto Cordova
quindi ho installato il plugin admob
https://i.stack.imgur.com/sSIeG.jpg

poi ho aggiornato l'SDK dell'android
https://i.stack.imgur.com/9Wdr0.jpg
ma quando compilo, mi restituisce l'errore:

codice:

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Could not find any matches for com.google.android.gmslay-services-ads

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ecco l'output

codice:

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1>MSBUILD : cordova-build error : FAILURE: Build failed with an exception. 1>MSBUILD : cordova-build error : * What went wrong: 1>MSBUILD : cordova-build error : A problem occurred configuring root project 'android'. 1>MSBUILD : cordova-build error : > Could not resolve all dependencies for configuration ':_debugCompile'. 1>MSBUILD : cordova-build error : > Could not find any matches for com.google.android.gmslay-services-ads:+ as no versions of com.google.android.gmslay-services-ads are available. 1>MSBUILD : cordova-build error : Searched in the following locations: 1>MSBUILD : cordova-build error :

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