Fresh install of WP 3.2.1 (with MU) - fatal exception

Server: PHP 5.3.5, Apache 2.2, Windows 7 box.

I've got a new install of WP 3.2.1 (with MU enabled) and have just installed this plugin. Seemed to work OK and I can create a new wiki.

When I view the new wiki (which works), and click either the EDIT or CREATE NEW tabs, I get the following error:

Fatal error: Call to undefined function wp_editor() in C:\xampp\htdocs\dev.profiles\wp-content\plugins\wiki\wiki-include.php on line 882

Has anyone else had this issue?