java.lang.RuntimeException: startPreview failed
	at android.hardware.Camera._startPreview(Native Method)
	at android.hardware.Camera.startPreview(Camera.java:902)
	at com.google.android.gms.vision.a$f.onPictureTaken(Unknown Source:28)
	at android.hardware.Camera$EventHandler.handleMessage(Camera.java:1291)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:223)
	at android.os.Looper.loop(Looper.java:324)
	at android.app.ActivityThread.main(ActivityThread.java:8378)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:582)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1059)