java.lang.RuntimeException: Fail to connect to camera service
	at android.hardware.Camera.<init>(Camera.java:585)
	at android.hardware.Camera.open(Camera.java:423)
	at com.google.android.gms.vision.a.j(Unknown Source:32)
	at com.google.android.gms.vision.a.d(Unknown Source:9)
	at com.entitcs.office_attendance.camera.CameraSourcePreview.f(Unknown Source:29)
	at com.entitcs.office_attendance.camera.CameraSourcePreview.d(Unknown Source:12)
	at com.entitcs.office_attendance.camera.CameraSourcePreview.e(Unknown Source:2)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity.R(Unknown Source:37)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity.B(Unknown Source:85)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity$h.onClick(Unknown Source:19)
	at android.view.View.performClick(View.java:7465)
	at com.entitcs.office_attendance.java_classes.MovableFloatingActionButton.onTouch(Unknown Source:171)
	at android.view.View.dispatchTouchEvent(View.java:14356)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3118)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2799)
	at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:537)
	at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1905)
	at android.app.Activity.dispatchTouchEvent(Activity.java:4227)
	at c.a.n.i.dispatchTouchEvent(Unknown Source:2)
	at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:495)
	at android.view.View.dispatchPointerEvent(View.java:14619)
	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6182)
	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5985)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5476)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5533)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5499)
	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5651)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5507)
	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5708)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5480)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5533)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5499)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5507)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5480)
	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8325)
	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8241)
	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:8202)
	at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8461)
	at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:227)
	at android.os.MessageQueue.nativePollOnce(Native Method)
	at android.os.MessageQueue.next(MessageQueue.java:342)
	at android.os.Looper.loop(Looper.java:197)
	at android.app.ActivityThread.main(ActivityThread.java:7806)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958)