HTTP/1.1 500 Internal Server Error
Content-Length: 120
Content-Type: application/json; charset=UTF-8
Date: Tue, 29 Nov 2011 00:33:48 GMT

{
    "instanceFault": {
        "code": 500,
        "message": "The server has either erred or is incapable of performing the requested operation."
    }
}