the root element is required in a well-formed document. message being parsed Error in SoapUI

Hi,

When I run BSSV in SoapUI, I am getting this following Error. Standard BSSVs are working fine. Custom BSSVs are giving this Error. It is working in JDeveloper.

   <soapenv:Header/>

   <soapenv:Body>

      <soapenv:Fault>

         <faultcode>soapenv:Server.generalException</faultcode>

         <faultstring>org.xml.sax.SAXParseException: The root element is required in a well-formed document. Message being parsed:</faultstring>

      </soapenv:Fault>

   </soapenv:Body>

</soapenv:Envelope>

Kindly help.

Thanks