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android.support.v7.widget.RecyclerView$SavedState
java.lang.NoClassDefFoundError: android.support.v7.widget.RecyclerView$SavedState	at android.support.v7.widget.RecyclerView.onSaveInstanceState(RecyclerView.java:1078)	at android.view.View.dispatchSaveInstanceState(View.java:14641)	at android.view.ViewGroup.dispatchFreezeSelfOnly(ViewGroup.java:3175)	at android.support.v7.widget.RecyclerView.dispatchSaveInstanceState(RecyclerView.java:1109)	at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3161)	at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3161)	at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3161)	at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3161)	at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:3161)	at android.view.View.saveHierarchyState(View.java:14624)	at com.android.internal.policy.impl.PhoneWindow.saveHierarchyState(PhoneWindow.java:2126)	at android.app.Activity.onSaveInstanceState(Activity.java:1456)	at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:564)	at android.support.v7.app.AppCompatActivity.onSaveInstanceState(AppCompatActivity.java:502)	at android.app.Activity.performSaveInstanceState(Activity.java:1383)	at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1286)	at android.app.ActivityThread.callCallActivityOnSaveInstanceState(ActivityThread.java:4473)	at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3845)	at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3908)	at android.app.ActivityThread.access$1200(ActivityThread.java:177)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:145)	at android.app.ActivityThread.main(ActivityThread.java:5942)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)