I installed and activated the new calendar of events plugin Agenda on my test server running 2.5.1.
I clicked to add an event and got the following error:
Fatal error: Call to undefined function add_thickbox() in /home/dotpublishinginc.com/www/htdocs/OCT/wp-content/plugins/agenda/agenda.php on line 151
Any thoughts? The plugin is said to be compatible with 2.5 and above, so it should not be an issue of upgrading to the latest version of WP.