java.lang.IllegalStateException: Observer xxx was not registered.

12-26 14:13:34.963 15989-15989/com.moreunion.zhenghao E/InputEventReceiver: Exception dispatching input event.
12-26 14:13:34.963 15989-15989/com.moreunion.zhenghao E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
12-26 14:13:34.971 15989-15989/com.moreunion.zhenghao E/MessageQueue-JNI: java.lang.IllegalStateException: Observer com.example.yilibrary.view.improvement.ImSwipeRecyclerViewLayout$AdapterDataObserver@362e265 was not registered.
                                                                              at android.database.Observable.unregisterObserver(Observable.java:69)
                                                                              at android.support.v7.widget.RecyclerView$Adapter.unregisterAdapterDataObserver(RecyclerView.java:6627)
                                                                              at com.example.yilibrary.view.improvement.ImSwipeRecyclerViewLayout.onDetachedFromWindow(ImSwipeRecyclerViewLayout.java:242)
                                                                              at android.view.View.dispatchDetachedFromWindow(View.java:15594)
                                                                              at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3230)
                                                                              at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3222)
                                                                              at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3222)
                                                                              at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3222)
                                                                              at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4771)
                                                                              at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4745)
                                                                              at android.view.ViewGroup.removeView(ViewGroup.java:4676)
                                                                              at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1440)
                                                                              at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574)
                                                                              at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1641)
                                                                              at android.support.v4.app.FragmentManagerImpl.dispatchDestroyView(FragmentManager.java:3002)
                                                                              at android.support.v4.app.Fragment.performDestroyView(Fragment.java:2461)
                                                                              at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1410)
                                                                              at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574)
                                                                              at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:789)
                                                                              at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2415)
                                                                              at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2200)
                                                                              at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2153)
                                                                              at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2034)
                                                                              at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:651)
                                                                              at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
                                                                              at android.support.v4.view.ViewPager.populate(ViewPager.java:1239)
                                                                              at android.support.v4.view.ViewPager.populate(ViewPager.java:1087)
                                                                              at android.support.v4.view.ViewPager$3.run(ViewPager.java:270)
                                                                              at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1996)
                                                                              at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:2126)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2212)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                              at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                              at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:447)
                                                                              at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
                                                                              at android.app.Activity.dispatchTouchEvent(Activity.java:3213)
                                                                           at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.
12-26 14:13:37.015 15989-15989/com.moreunion.zhenghao E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: com.moreunion.zhenghao, PID: 15989
                                                                        java.lang.IllegalStateException: Observer com.example.yilibrary.view.improvement.ImSwipeRecyclerViewLayout$AdapterDataObserver@362e265 was not registered.
                                                                            at android.database.Observable.unregisterObserver(Observable.java:69)
                                                                            at android.support.v7.widget.RecyclerView$Adapter.unregisterAdapterDataObserver(RecyclerView.java:6627)
                                                                            at com.example.yilibrary.view.improvement.ImSwipeRecyclerViewLayout.onDetachedFromWindow(ImSwipeRecyclerViewLayout.java:242)
                                                                            at android.view.View.dispatchDetachedFromWindow(View.java:15594)
                                                                            at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3230)
                                                                            at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3222)
                                                                            at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3222)
                                                                            at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3222)
                                                                            at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4771)
                                                                            at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4745)
                                                                            at android.view.ViewGroup.removeView(ViewGroup.java:4676)
                                                                            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1440)
                                                                            at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574)
                                                                            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1641)
                                                                            at android.support.v4.app.FragmentManagerImpl.dispatchDestroyView(FragmentManager.java:3002)
                                                                            at android.support.v4.app.Fragment.performDestroyView(Fragment.java:2461)
                                                                            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1410)
                                                                            at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574)
                                                                            at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:789)
                                                                            at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2415)
                                                                            at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2200)
                                                                            at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2153)
                                                                            at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2034)
                                                                            at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:651)
                                                                            at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
                                                                            at android.support.v4.view.ViewPager.populate(ViewPager.java:1239)
                                                                            at android.support.v4.view.ViewPager.populate(ViewPager.java:1087)
                                                                            at android.support.v4.view.ViewPager$3.run(ViewPager.java:270)
                                                                            at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1996)
                                                                            at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:2126)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2212)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2301)
                                                                            at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:447)
                                                                            at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
12-26 14:13:37.016 15989-15989/com.moreunion.zhenghao E/AndroidRuntime:     at android.app.Activity.dispatchTouchEvent(Activity.java:3213)
                                                                            at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
                                                                            at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:409)
                                                                            at android.view.View.dispatchPointerEvent(View.java:10232)
                                                                            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4856)
                                                                            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4717)
                                                                            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4249)
                                                                            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4302)
                                                                            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4268)
                                                                            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4395)
                                                                            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4276)
                                                                            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4452)
                                                                            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4249)
                                                                            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4302)
                                                                            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4268)
                                                                            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4276)
                                                                            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4249)
                                                                            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6676)
                                                                            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6650)
                                                                            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6611)
                                                                            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6803)
                                                                            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:192)
                                                                            at android.os.MessageQueue.nativePollOnce(Native Method)
                                                                            at android.os.MessageQueue.next(MessageQueue.java:356)
                                                                            at android.os.Looper.loop(Looper.java:138)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:6523)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)