Oct 13 2017
We have a slightly different but related issue. We are looking for a mechanism to synchronize templates and forms between wiki's in a wikifarm. So newer version of template A from wiki 1 to wiki 2, newer version of template B from wiki 2 to wiki 1 and so on. Using Git as a central repository. The solution Lex showed at SMWConv Fall in Rotterdam comes close to the need we have (development of forms and templates takes place in different wikis of the farm).
Jun 6 2017
At the moment we try to upgrade our wiki to MW 1.28.2 but I encounter exactly that same error (also see https://www.mediawiki.org/wiki/Topic:Trnjlmc7a4oobq1e). How can I fix this? I'm using the REL1_28-version of the VE.