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Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at com.majaxtn.fullprogress.Playing.showQuestion(Playing.java:81) at com.majaxtn.fullprogress.Playing.onResume(Playing.java:132) 81:txtQuestionNum.setText(String.format("%d / %d",thisQuestion, totalQuestion)); 132: showQuestion(index); How To Fix? => Check *    : * = (TextView) findViewById(R.id. txtScore ) ; * = (TextView) findViewById(R.id. txtTotalQuestion ) ;
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