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Attempt to invoke virtual method 'java.lang.String com.example.eric.myapp6.model.User_answer.getKonkoor_num()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.eric.myapp6.model.User_answer.getKonkoor_num()' on a null object reference at com.example.eric.myapp6.database.DataBase.deleteUser(DataBase.java:140) at com.example.eric.myapp6.exam_resault.pasokh_azmoon$1.onClick(pasokh_azmoon.java:50)