Error when starting Rails server with MySQL

Question

I'm running Rails 4.0.3 on Ruby 2.0.0 on Windows 7, and have installed the DevKit (all x64). I've installed the mysql2 gem using subst X: "C:\\Program Files\\MySQL\\MySQL Server 5.6" and then gem install mysql2 --platform=ruby -- --with-mysql-dir=X: , and it installed fine. I then created a new app with rails new mysql_testy which ran fine, but when I run rails server I get the following error:

C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/mysql2-0.3.15/lib/mysql2.rb:8:in 'require': 193: %1 is not a valid Win32 application.   - C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/mysql2-0.3.15/lib/mysql2/mysql2.so (LoadError)
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/mysql2-0.3.15/lib/mysql2.rb:8:in '<top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler/runtime.rb:76:in 'require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler/runtime.rb:76:in 'block (2 levels) in require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler/runtime.rb:72:in 'each'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler/runtime.rb:72:in 'block in require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler/runtime.rb:61:in 'each'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler/runtime.rb:61:in 'require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.5.3/lib/bundler.rb:131:in 'require'
from C:/Users/Liam/Ruby/mysql_testy/config/application.rb:7:in '<top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:74:in 'require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:74:in 'block in <top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:71:in 'tap'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:71:in '<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'`

Do you guys have any idea what's happening?

Answer 1

Not sure if you figured it out yet, but I was having the same issue. I installed the 32 bit sql connector, copied the libmysql.dll file from it and pasted it into Ruby/bin folder. Opened a new command prompt and was able to connect to the server.

Before this step though you may have to reinstall a fresh MySQL2 gem pointing to the path of the connector: gem install mysql2 --platform=ruby -- '--with-mysql-lib="C:\\mysql-connector\\mysql-connector-c-6.1.5-win32\\lib" --with-mysql-include="C:\\mysql-connector\\mysql-connector-c-6.1.5-win32\\include" --with-mysql-dir="C:\\mysql-connector"'

Hope this helps