Hi I am getting this response Corresponding User not found

Hi,

I am getting this response Corresponding User not found and my credentials are valid.

<?xml version="1.0" encoding="ISO-8859-1"?>

<serv:message xmlns:serv="http://www.webex.com/schemas/2002/06/service" xmlns:com="http://www.webex.com/schemas/2002/06/common" xmlns:meet="http://www.webex.com/schemas/2002/06/service/meeting" xmlns:att="http://www.webex.com/schemas/2002/06/service/attendee"><serv:header><serv:response><serv:result>FAILURE</serv:result><serv:reason>Corresponding User not found</serv:reason><serv:gsbStatus>BACKUP</serv:gsbStatus><serv:exceptionID>030001</serv:exceptionID></serv:response></serv:header><serv:body><serv:bodyContent/></serv:body></serv:message>

Hello,

     This error means that a WebEx ID you reference in your request does not match any available username on the site. If your security context is correct, there may be another WebEx ID in the body of the request.