Keep getting (#200) Requires extended permission: manage_groups" when I try to invite users to a group

Keep getting (#200) Requires extended permission: manage_groups" when I
try to invite users to a group

When I try to invite a user to my group I keep getting this
{ "error": { "message": "(#200) Requires extended permission:
manage_groups", "type": "OAuthException", "code": 200 } } error. I submit
to https://graph.facebook.com/GROUP_ID/members/USER_ID with an app access
token and the user I'm inviting is already member of the app.
So any solution to this?
Thanks,
Kent