Thread:Extension talk:SemanticACL/"Editable by" can't be used as a property name on this wiki

I got this message when trying this extension on this page of my wiki

My conf is (More details):


 * MediaWiki	1.21.2
 * PHP	5.4.30 (fpm-fcgi)
 * MySQL	5.5.14

Had someone the same problem ?

Thanks