java.lang.IllegalStateException: Could not execute method for android:onClick
	at androidx.appcompat.app.l$a.onClick(Unknown Source:32)
	at android.view.View.performClick(View.java:7570)
	at android.view.View.performClickInternal(View.java:7525)
	at android.view.View.access$3900(View.java:836)
	at android.view.View$PerformClick.run(View.java:28680)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:263)
	at android.app.ActivityThread.main(ActivityThread.java:8296)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006)
Caused by: java.lang.reflect.InvocationTargetException
	at java.lang.reflect.Method.invoke(Native Method)
	at androidx.appcompat.app.l$a.onClick(Unknown Source:23)
	... 11 more
Caused by: java.lang.NullPointerException: uri
	at java.util.Objects.requireNonNull(Objects.java:245)
	at android.content.ContentResolver.openInputStream(ContentResolver.java:1469)
	at com.entitcs.office_attendance.activities.register_complain_activity.N(Unknown Source:6)
	at com.entitcs.office_attendance.activities.register_complain_activity.submitComplain(Unknown Source:6)
	... 13 more