请教个问题

[qufl17173]

项目下载下来运行到Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
就会报错，
Process: com.lulu.weichatsamplevideo, PID: 28462
java.lang.RuntimeException: Fail to connect to camera service
at android.hardware.Camera.(Camera.java:497)
at android.hardware.Camera.open(Camera.java:342)
at com.lulu.weichatsamplevideo.MainActivity.startPreView(MainActivity.java:133)
at com.lulu.weichatsamplevideo.MainActivity.surfaceCreated(MainActivity.java:121)