java.lang.RuntimeException: Fail to connect to camera service
	at android.hardware.Camera.<init>(Camera.java:637)
	at android.hardware.Camera.open(Camera.java:458)
	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:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
	at android.view.View.layout(View.java:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	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:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1103)
	at android.view.View.layout(View.java:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	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:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	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:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	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:812)
	at android.view.View.layout(View.java:22088)
	at android.view.ViewGroup.layout(ViewGroup.java:6325)
	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3191)
	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2701)
	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1819)
	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7781)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1031)
	at android.view.Choreographer.doCallbacks(Choreographer.java:854)
	at android.view.Choreographer.doFrame(Choreographer.java:789)
	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1016)
	at android.os.Handler.handleCallback(Handler.java:883)
	at android.os.Handler.dispatchMessage(Handler.java:100)
	at android.os.Looper.loop(Looper.java:224)
	at android.app.ActivityThread.main(ActivityThread.java:7590)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)