CSS validation: Unknown error org.w3c.css.parser.analyzer.TokenMgrError: Lexical error at line 1, column 9. Encountered: "%" (37), after : ""

Hi,
I get 3 error messages when I try to test my side. When I remeber right, it 
already worked in past. But I'm not 100% sure whether it i an parser error or 
an error on my page. Could you check that please? Feedback would be nice.

http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.krankenschwesterrock.de%2Fhome.php%3Fgo%3Dguestbook&profile=css3&usermedium=all&warning=1&lang=en

Best Regards Rico
-- 
Wer der Meinung ist, daß man für Geld alles haben kann, gerät leicht in den 
Verdacht, daß er für Geld alles zu tun bereit ist. (Benjamin Franklin)