Validator fails code but does not give error message

Hi all

 

I was validating my first piece of XHTML code using the w2c validator
earlier today and got the following confusing output from the validator :-

 


Result:

Failed validation, 0 error 


File:

nl20.htm


Encoding:

iso-8859-1


Doctype:

-//w3c//DTD XHTML 1.0 Strict//EN

Unknown Parse Mode!

The MIME Media Type (text/html) for this document is used to serve both SGML
and XML based documents, and it is not possible to disambiguate it based on
the DOCTYPE Declaration in your document. Parsing will continue in SGML
mode. 


This page is not Valid -//w3c//DTD XHTML 1.0 Strict//EN!


Below are the results of attempting to parse this document with an SGML
parser. 

"

With no error messages. 

 

 

Have I found a bug?

 

Help!!!!

 

Paula Thomas