Problem with Syncronus senario in AAE

HI ,

I am working on SOAP to Proxy  syncronus senario in SAP PI7.1 using AAE (Intigrated configuration ,But i am getting the error as follows

SOAP: call failed: com.sap.engine.interfaces.messaging.api.exception.MessagingException: SOAP: response message contains an error XIAdapter/HTTP/ADAPTER.HTTP_EXCEPTION - HTTP 500 Error during conversion of XI message

I am not sure what is this error causing, can any body help me on this issue.

Thanks,