Facebook Error

This plugin looks like it will do exactly what I need, but I haven’t been able to tell for sure yet. I registered a Facebook App and copied over the keys. I got my numeric ID from findmyfacebookid.com. I hit Save, then Test. That redirects me to Facebook OAuth with a super-helpful error message: “An error occurred. Please try again later.” Anyone seen this? Any suggestions?

https://www.ads-software.com/extend/plugins/facebook/