"The stylesheet was not loaded because its MIME type, "text/html" is not "text/css"

I have a javascript application and when I run it on firefox I am getting the following erro on the console:

"The stylesheet was not loaded because its MIME type, "text/html" is not "text/css".

DumbStuck!!

EDIT: Note that it tells that "The stylesheet ABCD..." But ABCD is actually an HTML file.

Edit (ANSWER) : Actually I had wrongly put href="", and hence the html file was refenecing itself as the CSS. Mozilla had the similar bug once, and it is from there I got the answer. But everyone's else answers helped me too. Thanks.