Affected wiki(s): cy

Diff(s) (if applicable): https://cy.wikipedia.org/w/index.php?title=Y_rhyngrwyd&diff=prev&oldid=10872109

What is happening?:

generates 'Lua error in package.lua at line 80: module 'Module:Webarchive/data' not found.' error.

eg
https://cy.wikipedia.org/wiki/Y_rhyngrwyd
[Pls go down to the bottom of the page. 'See also' AND 'External links' sections]

What should happen instead?:
No error reported.

Other information:
BIG thanks!