My app uses facebook api for user login. On developing it works fine, but when I uploaded it to google play it stops working.
This is the error log:
I spent a full day trying to figure out why this wasn't working...
When generating the hash key for production you need to use openssl-0.9.8e_X64.zip on windows, you cannot use openssl-0.9.8k_X64.zip
The versions produce different hash keys, for some reason 9.8k does not work correctly... 9.8e does
Reference