WordPress requested URL ‘/$’ error

If you recently updated your WordPress installation, you may see the following error when trying to post a comment: “The requested URL ‘/$’ was not found on this server. “

If  you see this error, relax… it is likely just a plugin that is not compatible with your new version of WordPress.  To fix the problem, simply update all of your plugins to their latest versions, then try posting a comment again.  The problem should be resolved.