Visit https://en.m.wikipedia.org/wiki/The_Catwings_Collection?mobileaction=beta#/categories
Exception in module-execute in module mobile.categories.overlays:
Error: Module not found: modules/search/SearchApi Error: Module not found: modules/search/SearchApi(…)
Also a problem on mediawiki.org
https://m.mediawiki.org/wiki/Reading?mobileaction=beta#/categories