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    • java.lang.NullPointerException: Attempt to invoke virtual method 'boolean elektro_fr.my_android.ui.My_Fragment.isAdded()' on a null object reference at elektro_fr.my_android.ui.My_Activity.removeFragment( at elektro_fr.newapplication.Compito.Fragment.MainActivity.clickButtonOperation( at elektro_fr.newapplication.Compito.Fragment.Fragment_2.setGraphics( at elektro_fr.my_android.ui.My_Fragment.onCreateView( at
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