Board Thread:Support Requests - Getting Technical/@comment-38821337-20191019204033/@comment-9605025-20191019235026

The problem is that one of the subtemplates uses Lua and you did not import the necessary Lua modules for it to work. From the looks of it, you just need to add Module:String. This is a "global" module available from the dev wiki. For instructions on how to add this module to your wiki, see here.