[Plugin: Simple Facebook Connect] facebook app: app domain, hosting url, site url

Hi everybody

I am trying to configure SFC, but it seems not to be working, nothing is displayed (no recent activity, no live stream, etc.).
I have put my wordpress website url in the “site url” field. In the “app domain” field there were already my site url and high-dusk-7221.herokuapp.com, and in the “hosting url” field there is https://high-dusk-7221.herokuapp.com/.
I don’t know what to do…
Can you help configure my facebook app?

Thanks

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