Compare:
https://www.wikidata.org/w/index.php?title=Module:Linguistic&action=info&uselang=en
| Page content model | wikitext |
https://www.wikidata.org/w/index.php?title=Module:String&action=info&uselang=en
| Page content model | Scribunto |
I assume this is what causes the error
Lua error in package.lua at line 80: module 'Module:Linguistic' not found. (Q2)
Lua error in package.lua at line 80: module 'Module:Linguistic' not found. (P610)
Lua error in package.lua at line 80: module 'Module:Linguistic' not found. (Q513)
on Wikidata's main page.