Fatal error (#200) – If posting to a group, requires app being installed in the group

Fatal error: Uncaught Facebook\Exceptions\FacebookAuthorizationException: (#200) If posting to a group, requires app being installed in the group, and \ either publish_to_groups permission with user token, or both manage_pages \ and publish_pages permission with page token; If posting to a page, \ requires both manage_pages and publish_pages as an admin with \ sufficient administrative permission in

https://developers.facebook.com/community/threads/243630770409028/
https://developers.facebook.com/support/bugs/279765279722466/

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