User blog comment:Kirkburn/Technical Update: September 14, 2015/@comment-6475116-20150915210238/@comment-1757994-20150915215555

This condition happened to me last week when Wikia started testing their ContentReview extension on the wiki I use. Basically, it redefined "personal js" to be only global.js on Community, excluding even common.js, monobook.js, and wikia.js. It also blocked importArticles from importing any articles from User: space. It got fixed in about a day.

It may be that Wikia has given your wiki the unfixed version of the code.