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Can not perform this action after onSaveInstanceState. after onBackPress() of Activity. Fatal Exception: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState	at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1527)	at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:599)	at android.support.v4.app.FragmentActivity.onBackPressed(FragmentActivity.java:178)	at com.myapp.activities.ActivityManageContacts.onBackPressed(ActivityManageContacts.java:265)	at android.app.Activity.onKeyUp(Activity.java:2465)	at android.view.KeyEvent.dispatch(KeyEvent.java:2646)	at android.app.Activity.dispatchKeyEvent(Activity.java:2716)	at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:533)	at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:53)	at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:254)	at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:53)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2276)	at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4038)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4000)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3562)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3615)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3581)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3698)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3589)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3755)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3562)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3615)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3581)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3589)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3562)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3615)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3581)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3731)	at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3892)	at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2208)	at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1849)	at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1840)	at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2185)	at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)	at android.os.MessageQueue.nativePollOnce(MessageQueue.java)	at android.os.MessageQueue.next(MessageQueue.java:143)	at android.os.Looper.loop(Looper.java:122)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Method.java)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697)