Workaround

I'm trying to install the FCKeditor and for some reason I keep getting the following error
Not Found
The requested URL /modules/fckeditor/lib//editor/fckeditor.html was not found on this server.

when I try to add a page or anything that has an HTMLArea. I have read the installation instructions, and well it's not hard to install, but I don't know what could be causing the "Not Found" error. any info is appreciated.