Adding Service Refference Error

I'm getting an error while adding the web service reference to the VS 2010, has anyone faced this issue before?

 

the document at the url was not recognized as a known document type. The error message from each known type may help you fix the problem: - Report from 'XML Schema' is 'The root element of a W3C XML Schema should be and its namespace should be 'http://www.w3.org/2001/XMLSchema'.'. - Report from 'DISCO Document' is 'Discovery document at the URL could not be found.'. - The document format is not recognized. - Report from 'WSDL Document' is 'There is an error in XML document (2, 55).'. - The string '' is not a valid Uri value. Metadata contains a reference that cannot be resolved: The content type text/html; charset=utf-8 of the response message does not match the content type of the binding (application/soap+xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly.