error msg from XML response

in this code there is a XML error msg after sening request to the server, how to fix   
this error ?
<?xml version="1.0" encoding="utf-8"?>
//soap body
 <soap:Body>
//check for response
  <CheckAvailabilityResponse xmlns="http://ift.tt/1pD0Kdp">
//check the result   
   <CheckAvailabilityResult>
//response
     <response>

//result code

//error message Current ScriptID=2. Expected step should be to register domains example.us and

example.biz.