Thread:Extension talk:Access Control Panel/MW = 1.21.1 and AccessControlPanel error and solution

According to mediawiki from MW1.21.1 the function wfLoadExtensionMessages is removed. (other interesting link https://www.mediawiki.org/wiki/Special:Code/MediaWiki/52503 )

Now, AccessControlPanel don't works and you have to edit AccessControlPanel.body.php and comment (with //) row 27 :

wfLoadExtensionMessages('AccessControlPanel');

and it works!