What's this?

I don't understand what this means (Duplicate arguments in template calls) so can someone explain a little? Thanks
Dominic305.png Dominic305  Talk  Contribs  Scratch 
13:08, 2 May 2019 (UTC)

If someone uses a template like this:
{{template
|argument=value
|argument=another value
}}
(or in general specifies the same argument twice) it's idiotic and doesn't work and pages that do that go in this category.
Kenny2scratch logo.jpg kenny2scratch  Talk  Contribs  Directory 
13:09, 2 May 2019 (UTC)