File does not exist: wp-includes

I’m seeing these in my apache logs on every page load. Where is this coming from?

[Sat Jul 31 22:51:55 2010] [error] [client ::1] File does not exist: /Users/JesseCuster/Sites/wp-includes, referer: https://localhost:8888/wordpress/projects
[Sat Jul 31 22:51:55 2010] [error] [client ::1] File does not exist: /Users/JesseCuster/Sites/wp-includes