$Exception: Port '' doe

Dear All,

I am using OutboundRFC flow service of the SAP Adapter. I am providing the appropriate serverName , rfcName and Port to this flowservice in pipeline. But I am getting the error - "$Exception: Port ‘’ does not exist in the table of port descriptions ". I have no idea why this error is coming. Any help /suggestion in resolving this problem will be very useful.

Thanks in advance,
Kishen Das