Unclear error regarding tags

[MinThaMie]

I recently started using empress and this morning I got an error regarding tags.
I figured out the problem in the end by looking at another post to see where I went wrong. The error did not point me in the right direction.

I created a tag using the ember g tag command and after adding the tag I got the error in the screenshot.

my code: tags: mental-health. in the end I figured out it should have been

tags: 
  - mental-health

but based on the error I thought something was wrong with my tag, and not with my syntax in the yaml