java.lang.IllegalArgumentException

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    • java.lang.IllegalArgumentException: The observer is null. at android.database.Observable.unregisterObserver(Observable.java:59) at android.widget.BaseAdapter.unregisterDataSetObserver(BaseAdapter.java:42) at android.widget.AbsListView.onDetachedFromWindow(AbsListView.java:2373) at android.view.View.dispatchDetachedFromWindow(View.java:9756) at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2274) at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2272) at android.view.ViewGroup.removeAllViewsInLayout(ViewGroup.java:3724) at android.view.ViewGroup.removeAllViews(ViewGroup.java:3679)

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