"duplicated mapping key" error in publication.yaml

[ACMAA]

Hello all - I am trying refind my Quire legs as it has been nearly three years since I've worked in Quire. I'm trying to run quire preview in terminal and I keep getting this error, duplicated mapping key, and I'm not sure what it's trying to tell me:

And this is my publication.yaml file:

Any advice would be appreciated!
Michelle Padilla / Amon Carter Museum of American Art

[geealbers]

Hi Michelle, welcome back to Quire!

You don't need the additional instances of contributor: in your YAML. It would just appear once, and each contributor would be listed below it with a hyphen.

contributor:
  - id:
  - id:
  - id:

[ACMAA]

Thanks @geealbers! That worked! Now I've got to fix the rest of the errors!