Can not add a new field in collection

I have a new Strapi app using postgre database. And this is what I do to my new Strapi

  1. upload my old “/srv/strapi/strapi-development/api” folder to my new Strapi app. and
  2. import my postgre DB to the new postgre DB Strapi app
  3. then new Strapi automaticly add collection that I upload before.

But, I can’t modify my collection’s field (add new field, update or delete)
it said

How can I fix this?