Administrate: Rails 6 rich text editor

[faqndo97]

Hi! I'm having a trouble when I added administrate to my project. I'm starting it, then I only have a post model (yes has a blog) with title and a rich text association.

When I added administrate gem, and after run rails g administrate:dashboard post, when I go to the admin/posts path, return me this error:

Do you know why this error is happening? (I'm new with administrate gem, is my first time using it, maybe I'm now following some step)

[faqndo97]

I resolved reading this two post in the wiki:

https://github.com/thoughtbot/administrate/wiki/Field:-RichTextAreaField
https://github.com/thoughtbot/administrate/wiki/Rails-6-&-Webpacker

thanks!