HTTP/1.1 500 Internal Server Error
Content-Type: application/json;charset=utf-8
{"Fault":
   {"xmlns":"http:\/\/www.active-endpoints.com\/2004\/06\/bpel\/extensions\/",
    "faultcode": 
           {"name":"invalidVariables",
            "namespace": "http:\/\/docs.oasis-open.org\/wsbpel\/2.0\/process\/executable",
            "xmlns":""
            },
     "faultstring":
           {"xmlns":"",
            "$t":" fault error message"
           }
  }
}