Page Layout ⇒ Big problem with fancy pagestyle

[adrienne]

Hello!
(I'm French so sorry if my english's bad...)
So, I'm using Lyx and the class "article (paper)" for a report. Everything's fine, exept when I try to add a footer:
I put "\usepackage{fancyhdr}" in preamble then "\pagestyle {fancy}" in order to add a "cfoot{...}"
but then when I try to view the pdf file, i got error messages saying (all) "latex error: undefined color 'BLACK' ".In the description panel, all the errors are different... I don't understand because evrything was working before that.
i work on a MacBook and download all the packages that I need.

Can somebody help?

[josephwright]

There is more to this than you have described. The package you are using will work fine without loading colour support. Can you post a full example of what you are doing.