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Attempt to invoke virtual method 'void android.widget.TextView.setText(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)