java.lang.NoClassDefFoundError: android/os/AsyncTask

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java.lang.NoClassDefFoundError: android/os/AsyncTask
at android.webkit.WebView.setupPackageListener(WebView.java:1266)
at android.webkit.WebView.(WebView.java:1137)
at android.webkit.WebView.(WebView.java:1097)
at android.webkit.WebView.(WebView.java:1086)
at android.webkit.WebView.(WebView.java:1076)
at android.webkit.WebView.(WebView.java:1067)
at com.google.android.gms.ads.internal.util.g.f(SourceFile:400)
at com.google.android.gms.ads.internal.util.g.a(SourceFile:385)
at com.google.android.gms.ads.internal.n.e.a(SourceFile:292)
at com.google.android.gms.ads.internal.b.(SourceFile:299)
at com.google.android.gms.ads.internal.b.(SourceFile:285)
at com.google.android.gms.ads.AdManagerCreatorImpl.a(SourceFile:36)
at com.google.android.gms.ads.internal.client.o.onTransact(SourceFile:66)
at android.os.Binder.transact(Binder.java:297)
at com.google.android.gms.internal.aa.a(Unknown Source)
at com.google.android.gms.internal.n.b(Unknown Source)
at com.google.android.gms.internal.n.a(Unknown Source)
at com.google.android.gms.internal.ag.a(Unknown Source)
at com.google.android.gms.ads.AdView.a(Unknown Source)

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