Thread:Extension talk:WikiSEO/Error: invalid magic word 'seo'

I have installed via git clone, and any of my pages now has the error...

[3907f866] /index.php?title=Special:RecentChanges Exception from line 341 of /homepages/11/d105371755/htdocs/wiki/includes/MagicWord.php: Error: invalid magic word 'seo'