求助 Fail to connect to camera service 给了相机权限了 还是报错

W/CameraBase: An error occurred while connecting to camera: 0
W/System.err: java.lang.RuntimeException: Fail to connect to camera service
        at android.hardware.Camera.native_setup(Native Method)
        at android.hardware.Camera.<init>(Camera.java:472)
W/System.err:     at android.hardware.Camera.open(Camera.java:445)
        at com.znq.zbarcode.camera.CameraManager.openDriver(CameraManager.java:65)
        at com.znq.zbarcode.CaptureActivity.initCamera(CaptureActivity.java:142)
        at com.znq.zbarcode.CaptureActivity.surfaceCreated(CaptureActivity.java:360)
        at android.view.SurfaceView.updateWindow(SurfaceView.java:671)
        at android.view.SurfaceView.access$000(SurfaceView.java:90)
        at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:195)
        at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2191)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
        at android.view.Choreographer.doCallbacks(Choreographer.java:591)
        at android.view.Choreographer.doFrame(Choreographer.java:560)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
        at android.os.Handler.handleCallback(Handler.java:808)
        at android.os.Handler.dispatchMessage(Handler.java:103)
        at android.os.Looper.loop(Looper.java:193)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5339)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
        at dalvik.system.NativeStart.main(Native Method)
E/CaptureActivity: Unexpected error initializing camera
这是报错的地方
能加的权限我都加了 
求助啊!!!