Today I updated my installation of Simple Press using the built-in updater. During the update it stopped and posted an error. It basically said that the update was aborted.

If I click on any link (Admin CP or front end) I get this error message.

Fatal error: Call to undefined function wp_create_nonce() in /problem-with-post-edit-buttonome/digitall/public_html/wp-content/sp-resources/forum-plugins/private-messaging/sp-pm-plugin.php on line 27

Note that this is the only thing displayed; therefore, the site digitalliteracyproject.com is down.

Any ideas?