Rails / MySQL2: Error - Unknown database

Question

I'm following a basic tutorial in Linda. I have been able to install everything properly now, but when I start my Rails server I get this message when I visit localhost:3000:

Unknown database 'simple_cms_development'

and then

Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms)
Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (23.5ms)
Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (29.8ms)

Answer 1

Have you created the database in MySQL? You should be able to run rake db:create and have Rails create it for you.

Answer 2

I had the same error, please run the following command on the Command Prompt:

rake db:create 

to solve the problem.

Answer 3

Look for the answers of these questions:

1. Have you installed the mysql2 gem?
2. Is it mentioned in your Gemfile?
3. Did you run the command rake db:create ?