Error 300 - multiple choices

Hello

on my page www.bardnet.de/aktuell2.htm do I have a button linking http://validator.w3.org/check/referer but I receive the error 300. How does it happen?

The request to make sure I've entered the right URI is of course impossible to follow because I've used the referer. What to do?

Regards
Bard

www.bardnet.de