java.lang.RuntimeException: Fail to connect to camera service
	at android.hardware.Camera.<init>(Camera.java:643)
	at android.hardware.Camera.open(Camera.java:464)
	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.onLayout(Unknown Source:44)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at com.android.internal.policy.DecorView.onLayout(DecorView.java:804)
	at android.view.View.layout(View.java:23062)
	at android.view.ViewGroup.layout(ViewGroup.java:6468)
	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3588)
	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3056)
	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2057)
	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8362)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1058)
	at android.view.Choreographer.doCallbacks(Choreographer.java:880)
	at android.view.Choreographer.doFrame(Choreographer.java:813)
	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1043)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:236)
	at android.app.ActivityThread.main(ActivityThread.java:7861)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:600)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:967)