Проблемы с Google Mobile Ads

[Derto]

При билде без данного пакета apk-файл создается без проблем, но при импорте данного пакета и билде в консоли выскакивает это
Failed to compile resources with the following parameters:
-bootclasspath "C:/AndroidSDK\platforms\android-25\android.jar" -d "C:\Users\Леонид\Documents\Anim\Temp\StagingArea\bin\classes" -source 1.6 -target 1.6 -encoding UTF-8 "android\support\v4\R.java" "com\bcoders\Game1\R.java" "com\google\android\gms\R.java" "com\google\android\gms\ads\R.java" "com\google\android\gms\ads\impl\R.java" "com\google\android\gms\base\R.java" "com\google\android\gms\clearcut\R.java" "com\google\android\gms\gass\R.java" "com\google\android\gms\tasks\R.java" "com\google\unity\R.java"
warning: C:\AndroidSDK\platforms\android-25\android.jar(java/lang/Object.class): major version 52 is newer than 51, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
warning: C:\AndroidSDK\platforms\android-25\android.jar(java/lang/AutoCloseable.class): major version 52 is newer than 51, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
2 warnings

UnityEditor.HostView:OnGUI()