Caused by: java.lang.RuntimeException: Fail to connect to camera service

[demonsantosh]

Process: com.example.android.mediarecorder, PID: 8478
java.lang.RuntimeException: An error occurred while executing doInBackground()

Caused by: java.lang.RuntimeException: Fail to connect to camera service
at android.hardware.Camera.(Camera.java:589)
at android.hardware.Camera.open(Camera.java:439)
at com.example.android.common.media.CameraHelper.getDefaultCameraInstance(CameraHelper.java:103)
at com.example.android.mediarecorder.MainActivity.prepareVideoRecorder(MainActivity.java:141)
at com.example.android.mediarecorder.MainActivity.access$000(MainActivity.java:42)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:217)
at com.example.android.mediarecorder.MainActivity$MediaPrepareTask.doInBackground(MainActivity.java:212)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)

[lrnrzg]

I also meet it, how do you solve it?