Error message: Referer wrong (when editing)

Dean Landsman
Sun, 27 Jul 2003 13:39:34 -0400

Attempting to edit the blogroll on the blog, I get the following message:

Sorry! There was an error: Can't evaluate the expression because the name
"referer" hasn't been defined.
The error was detected by Frontier 9.0 in mainResponder.respond. Webmaster: Time: Sun, 27 Jul 2003 17:38:14 GMT.

Two questions:

What can this mean, and how to overcome it?

Thanks in advance.