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

The issue for me (at the time of writing this) was when adding hash directly in Facebook Login -> Settings page. For some strange reason it does not save it correctly.

I fixed this with going to Quickstart and adding hashes in one of the steps and hitting Save. (fix will probably be obsolete when they fix their web page)

I did not have an issue with the tool, it generated correct hash. People with wrong Play store hashes probably have Play store signing enabled or entered wrong credentials.