rails cannot load such file -- mysql2/mysql2 (LoadError)

Question

I am newbie to ruby on rails i could not find the solution for this error:

rails s

---

/usr/local/share/gems/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `require': cannot load such file -- mysql2/mysql2 (LoadError)
from /usr/local/share/gems/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `<top (required)>'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
from /home/Harish/Documents/simple_cms/config/application.rb:7:in `<top (required)>'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:76:in `require'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:76:in `block in <top (required)>'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:73:in `tap'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:73:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

Answer 1

gem uninstall mysql2

gem install mysql2 --platform=ruby

delete the mysql2 gem directory in your rails specific bundle directory and copy paste this newly install mysql2 gem