Gem::LoadError for mysql2 gem, but it's already in Gemfile

Question

Gem::LoadError
Specified \'mysql2\' for database adapter, but the gem is not loaded.
Add `gem \'mysql2\'` to your Gemfile

This error occurred while

Answer 1

This issue may occur if you're using newer version of rails > 4

Do these two simple steps, it will work. Open your Gemfile and find the below line

gem 'mysql2'

replace that line with a specific mysql version like below

gem 'mysql2', '~> 0.3.18'

Now stop the server and run bundle

bundle install

Now restart your server. It should work.

rails s