Sitemap Errors

I got the following errors on these files, when compiling a sitemap. Is there anyway I can re-install the following files?

/plugins/tiny_mce/plugins/contextmenu/css/contextmenu.css    FAILED

/plugins/tiny_mce/themes/advanced/css/editor_ui.css     FAILED

Any help would be appreciated. Thanks,

Those are just css files, why is your site map trying to pull a page that ends with .css ?  There is absolutely no reason for this, as the css files are just a small part of the page that is being built.