Login Error: There is an error in logging you into this application. Please try again later

Question

I am getting this error. When I try to sign in with facebook to my app. When I first time authentication it will correctly working. After I unistalled my application and now

Answer 1

I had the same problem today on my sites and then realised that I was using the old default_graph_version = v3.2. I've changed it to the latest:

default_graph_version = v4.0

Now everything works again. Give it a try.