Thread:Extension talk:Scribunto/Lua error: language code ' lang ' is invalid./reply (3)

Thanks for pointg me in the right direction. It was a line forgetting to include Geshi highlighter, so the module wouldn't load. However, the error message module of MediaWiki is just plain shit, no debug, no common sense error message given.

http://bicyclesworkintheworld.com/Module:Formatnum

Check this now - still a problem: http://bicyclesworkintheworld.com/File:Navigation_arrows_Sydney.JPG