I am facing the below issue while fetching the layout for account using SOAP tool. Kindly let me know how to solve this error. I have succesfully login via SOAP tool got the session id but while describing the layout I am getting the below error:

 
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:enterprise.soap.sforce.com">
   <soapenv:Header>
     
      <urn:SessionHeader>
         <urn:sessionId>Gau7XKaiaOertNGQf6UAkJiLTzNWDaW9TjrL6vq56kHRXC4yQpRj8_LLq3DZih2</urn:sessionId>
      </urn:SessionHeader>
   </soapenv:Header>
   <soapenv:Body>
      <urn:describeLayout>
         <urn:sObjectType>Account</urn:sObjectType>
         <urn:layoutName>Account Layout</urn:layoutName>
         </urn:describeLayout>
   </soapenv:Body>
</soapenv:Envelope>
*************************************************************************
Error:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:sf="urn:fault.enterprise.soap.sforce.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
      <soapenv:Fault>
         <faultcode>UNKNOWN_EXCEPTION</faultcode>
         <faultstring>UNKNOWN_EXCEPTION: Destination URL not reset. The URL returned from login must be set in the SforceService</faultstring>
         <detail>
            <sf:UnexpectedErrorFault xsi:type="sf:UnexpectedErrorFault">
               <sf:exceptionCode>UNKNOWN_EXCEPTION</sf:exceptionCode>
               <sf:exceptionMessage>Destination URL not reset. The URL returned from login must be set in the SforceService</sf:exceptionMessage>
            </sf:UnexpectedErrorFault>
         </detail>
      </soapenv:Fault>
   </soapenv:Body>
</soapenv:Envelope>

Please reply in case you have solution .