Returning synchronous error notification to calling application

Hi, I try configuration my XI for sender and received using RFC with file adapter and received this message:

Error - Retuning synchronous error notification to calling application: Received HTTP response code 404.

Error - Transmitting the message using connection http://<server>:51400/sap/xi/engine?type=entry failed, due to: Received HTTP response code 404.

Error - The message status set to fail.

Who can hep-me ???

I dont know what's happing.

Thanks.