It could be a power issue - the camera interface comes up, but the message clearly says it can't start the camera. Could be that there is not enough juice to drive the phone chip (possible other chips BT, WiFi, GPS) and run the Autofocus camera.
So the safest thing to do is not power on the camera chip. Based on battery life specs that call out how much battery time you get in camera mode (and it is less then watching video) - I would bet the camera sucks down some serious juice.