Error: Invalid Scopes

You should submit your app for Facebook review.
As per the Facebook platform changes and policy updates in last year ,you should submit your app to Facebook for the permissions publish_pages and manage_pages as described here : https://help.xyzscripts.com/docs/social-media-auto-publish/faq/how-can-i-create-facebook-application/#appreview
Or you can use our approved app(smapsolution’s App) mentioned in the settings page which is a hosted solution hence require payment.
Hope this helps.
Thank You.