java.lang.RuntimeException: An error occurred while executing doInBackground()
	at android.os.AsyncTask$4.done(AsyncTask.java:399)
	at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
	at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
	at java.util.concurrent.FutureTask.run(FutureTask.java:271)
	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:919)
Caused by: java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0
	at android.util.SparseArray.valueAt(SparseArray.java:325)
	at com.entitcs.office_attendance.FaceRecognitionRelated.object.FaceRecognitionActivity.trainImageForSelfi(FaceRecognitionActivity.java:179)
	at com.entitcs.office_attendance.FaceRecognitionRelated.object.FaceRecognitionActivity.access$000(FaceRecognitionActivity.java:65)
	at com.entitcs.office_attendance.FaceRecognitionRelated.object.FaceRecognitionActivity$1.doInBackground(FaceRecognitionActivity.java:123)
	at com.entitcs.office_attendance.FaceRecognitionRelated.object.FaceRecognitionActivity$1.doInBackground(FaceRecognitionActivity.java:106)
	at android.os.AsyncTask$3.call(AsyncTask.java:378)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	... 4 more