Facebook is drooping support to its old SDK versions periodically. When ever this happens, we need to make sure we are not using an unsupported SDK. This guide shows how to upgrade Facebook SDK version.
Use Facebook's API Upgrade Tool to see the changes between different API versions.
Edit the file config/facebook_sdk_version.rb. There are two configurations in that file
SERVER
: The current server-side SDK versionCLIENT
: The current client-side JavaScript SDK version
Make the version change and test that everything works.