RDF not validating

I get the following error from the W3C validation service for all of my RDF feeds and pages when trying to validate them.

An attempt to load the RDF from URI 'http://iteego.info/node/586/rdf' failed. (Undecodable data when reading URI at byte 0 using encoding 'UTF-8'. Please check encoding and encoding declaration of your document.)

It seems there is an encoding problem somewhere but I have no idea how to troubleshoot it. Any advice? Thanks.