Failure about groups?

With 3 posts it went OK.
Now i get an error about groups but I am conncted with fb page/site.
Same failure after reconnecting to facebook:

Error Posting to Facebook: (#200) If posting to a group, requires app being installed in the group, and \ either publish_to_groups permission with user token, or both pages_read_engagement \ and pages_manage_posts permission with page token; If posting to a page, \ requires both pages_read_engagement and pages_manage_posts as an admin with \ sufficient administrative permission

The page I need help with: [log in to see the link]