Ruby on Rails - cannot load such file — mysql2/2.2/mysql2 (LoadError)

Question

I was using SQLite for my Rails project but when I heard that Heroku doesn\'t support SQLite, I switched to MYSQL.

After switching my database, I started my rails se

Answer 1

I just got them same problem after updating from Ruby 2.1.5 to 2.2.1. The problem seems to be the mysql2 gem that's used by Rails as a binding to libmysql. Apparently it does not support the Ruby 2.2 branch but only 2.0 and 2.1.