Error when trying to edit posts WP 2.8.4

Here’s the error I get when trying to click the “edit post” link to edit the content of any post…

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 72 bytes) in /home/webcopy/public_html/josephratliff.com/blog/wp-includes/post.php on line 3234

This did not happen before this morning.