SOAP XI Servlet returned "500 Internal Server Error"

Hi

Recently, we have NW 7.4 PO SP03 installed with CTC wizard steps executed as per (here). However, we are getting "500 Internal Server Error" when we tried to test the SOAP XI servlet URL by passing "http://<host>:<port>/XISOAPAdapter/MessageServlet?ximessage=true" in the browser. We are not sure what went wrong with this. Any steps we missed here?

Thanks!

Regards,

SP