MANIFEST PERMISSIONS WON'T WORK on Android 6.0

Failed to open camera
java.lang.RuntimeException: Fail to connect to camera service
at android.hardware.Camera.open(Camera.java:499)
at com.google.zxing.client.android.camera.open.OpenCameraInterface.open(OpenCameraInterface.java:83)
at com.journeyapps.barcodescanner.camera.CameraManager.open(CameraManager.java:121)
at com.journeyapps.barcodescanner.camera.CameraInstance$3.run(CameraInstance.java:158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:168)
at android.os.HandlerThread.run(HandlerThread.java:61)

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