File --> File sceranio problem

I am having some problem in the file-file scenario at the sender file adapter level. Please look at the following message:

2006-01-09 10:23:17 Error Attempt to parse XI system response failed

2006-01-09 10:23:17 Error Transmitting the message to endpoint http://host:port using connection AFW failed, due to: com.sap.aii.af.ra.ms.api.MessagingException: Could not parse XMBMessage due to invalid content type for SOAP: TEXT/HTML.