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:7540)
	at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
	at android.view.View$PerformClick.run(View.java:29710)
	at android.os.Handler.handleCallback(Handler.java:942)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:240)
	at android.os.Looper.loop(Looper.java:351)
	at android.app.ActivityThread.main(ActivityThread.java:8422)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)
Caused by: java.lang.reflect.InvocationTargetException
	at java.lang.reflect.Method.invoke(Native Method)
	at androidx.appcompat.app.l$a.onClick(Unknown Source:23)
	... 12 more
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void n8.b.d()' on a null object reference
	at n8.a$e.a(Unknown Source:2)
	at n8.a.c(Unknown Source:8)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity.groupAttendance(Unknown Source:2)
	... 14 more