Category:CatAutoTOC generates no TOC

From 2021pedia
<templatestyles src="Module:Message box/cmbox.css"></templatestyles>
CatAutoToc effect Pages %
No TOC 12 Lua error in package.lua at line 80: module 'Module:Sortkey' not found.
Standard {{Category TOC}} 0 Lua error in package.lua at line 80: module 'Module:Sortkey' not found.
{{Large category TOC}} 0 Lua error in package.lua at line 80: module 'Module:Sortkey' not found.
Total 12
Purge this page to update the totals.

Categories which use {{CatAutoTOC}}, grouped by what CatAutoToc does on each page:

Templates which transclude {{CatAutoTOC}} are categorised in

<templatestyles src="Module:Large category TOC/styles.css"></templatestyles>