User blog comment:Kirkburn/Technical Update: June 24, 2015/@comment-24473195-20150624200815/@comment-3032314-20150625230147

@Dessamator: I inadvertently tested this with Module:User error, which depends on Module:Pack. It worked fine on dev wiki, but I got the following error on my main wiki:

Lua error in package.lua at line 80: module `Module:Pack' not found.

Changing  to fixed the problem.