[Plugin: WP-Calendar] Error message on event page

Hi, on the page to create/edit an event, I get the following error message at the bottom:

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘wp_tiny_mce_preload_dialogs’ was given in /home/davewel/davidawells/wp-includes/plugin.php on line 405

I’ve just installed the plugin on a fresh WP install, and I have only a couple of other plugins active at the moment.