Error: Error validating access token: The session has been invalidated because the user changed their password or Facebook has changed the session for security reasons.

One of the variants of theerrorthat appears in the service interface when the user through whom the account was connected to the service has changed their Facebook password but has not reauthorized in the account settings.
To solve the problem, go to the settings of the required account in theSettings - Social profiles sectionand reauthorize as the administrator of the Facebook page.