android - java.lang.IllegalArgumentException: The observer is null -

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The user of one of my apps has reported this error, how to fix it Am in After a bit of googling ... there is still no luck before anyone has seen it or how can he fix it? 

  java.lang.IllegalArgumentException: Supervisor is zero. On Android.database.Observable.unregisterObaserver (Observable.java59) android.widget.baseAdapter.unregisterDataSetObserver (BaseAdapter.java 42) android.widget.HeaderViewListAdapter.unregisterDataSetObserver (HeaderViewListAdapter.java:256) at android.widget Android on Android.view.ViewGroup.dispatchDetachedFromWindow (ViewGroup.java1968) Android on View.ViewGroup.dispatchDetachedFromWindow (ViewGroup) View.View.dispatchDetachedFromWindow (Dekenkjawa: 8197) AbsListView.onDetachedFromWindow (AbsListView.java 3030) Java: 1966) android.view.ViewGroup.removeViewInternal (ViewGroup.java:3257) android.view.ViewGroup.removeViewInternal (ViewGroup. java: 3237) on android.view.ViewGroup.removeView (ViewGroup.java:3185) com.aheudev.a.slickdeals.adapters.DealPageAdapter.destroyItem (DealPageAdapter.java:174) android.support.v4.view.ViewPager on .populate (ViewPager.java:415) on android.support.v4.view.ViewPager.computeScroll .completeScroll (ViewPager.java:696) on android.support.v4.view.ViewPager (ViewPager.java:668) android .view.ViewGroup.drawChild at (ViewGroup.java.2434) android.view.ViewGroup.dispatchDraw (ViewGroup.java 1818) on android.view.View.draw (see .Java: 9282) android.view.ViewGroup.drawChild (ViewGroup.java:2584) android.view.ViewGroup.dispatchDraw (ViewGroup.java, 1818) On Android and on Android.view.ViewGroup.drawChild (ViewGroup.java:2582) On view.ViewGroup.dispatchDraw android.view.ViewGroup.drawChild (ViewGroup.java:2582) to (ViewGroup.java:2189) android.view.ViewGroup.dispatchDraw (ViewGroup.java:2189) on android.view.View.draw Com.android.internal.policy.impl.PhoneWindow $ DecorView.draw at android.widget.FrameLayout.draw (FrameLayout.java:419) at (View.java:9282) (PhoneWindow.java1923) on android.view. ViewRoot.draw (ViewRoot.java:1695) android.view.ViewRoot.performTraversals (ViewRoot.java:1410) android.view.ViewRoot.handleMessage (ViewRoot.java:2040) (handler On android.os.Handler.dispatchMessage .java: 99) at android.os. Looper Loop (Looper.java:132) on Android.app .ActivityThread.main (ActivityThread.java:4123) com.android.internal.os at java.lang.reflect.Method.invokeNative (native resident method) java.lang.reflect .method.invoke (Method.java:491) at dalvik.system.NativeStart.main (Native Method)   and it came from this function in my PagerAdapter:  
  @Override Public Null destroyedItem (Visual Compilation, Integer Position, object view) {(ViewPager) collection) .removeView (see (see)); }  "itemprop =" text "> 
 I was also having the same problem and it looks like unregisterDataSetObserver is on my DealPageAdapter how to fix twice being said, I'd overwrite Apanjikritdetasetobsrhwar your adapter'd like  
  @Override public void Apanjikritdetasetobsrhwar (Detasetobsrhwar observer) {if (supervisor! = Zero) {super.unregisterDataSetObserver (supervisor); }}   
 Hope this helps!

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