Test XML inbound into XIF via SOAP

When i try to test the SOAP/RFC service, using link sapcr1.xxxxxxxxx.net:8010/sap/bc/soap/rfc?sap-client=010>

I am recieving the following Server Error:

<?xml version="1.0" encoding="UTF-8" ?>

- http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC=" http://schemas.xmlsoap.org/soap/encoding/">

- <SOAP-ENV:Body>

- <SOAP-ENV:Fault>

<faultcode>SOAP-ENV:Server</faultcode>

<faultstring>Internal Server Error</faultstring>

<detail>SoapDoc::Init: Cannot set inout buffer</detail>

</SOAP-ENV:Fault>

</SOAP-ENV:Body>

</SOAP-ENV:Envelope>

How do i remove this error? or test this RFC service successfully?

Thanks for the expert advice in advance.