Facebook Feed error

I am getting the following error on the AUTH tab of FlowFlow Lite. It shows up under Facebook auth settings under the Access Token.

! Extended token is not generated, Facebook feeds might not work

Also, on the public site, there is this message:
If you see this then you are administrator and Flow-Flow got errors from APIs while requesting data. Please go to plugin admin and after refreshing page check for error(s) on stream settings page. Please provide error message info if you are doing support request.