errors showing up in wordpress error log

I noticed these warnings:

[01-Sep-2013 07:51:53 UTC] PHP Warning: include() [function.include]: Failed opening '/home/mcmaster/public_html/firstchurchofatheism.org/wp-admin/js/revisions-js.php' for inclusion (include_path='.:disappointed:usr/lib/php:disappointed:usr/local/lib/php') in /home/mcmaster/public_html/firstchurchofatheism.org/wp-content/plugins/wiki/wiki-include.php on line 710