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java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState	at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1318)	at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:488)	at android.app.Activity.onBackPressed(Activity.java:2167)	at android.app.Activity.onKeyDown(Activity.java:2063)	at android.view.KeyEvent.dispatch(KeyEvent.java:2609)	at android.app.Activity.dispatchKeyEvent(Activity.java:2375)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1847)	at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3701)	at android.view.ViewRootImpl.handleImeFinishedEvent(ViewRootImpl.java:3651)	at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:2818)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5041)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)	at dalvik.system.NativeStart.main(Native Method)