Ruby on Rails

Ok,

I dropped the schema blog, I change the pwd and I change the adapter
like this:
development:
adapter: mysql2
encoding: utf8
database: blog_dev
pool: 5
username: root
password:
socket: /tmp/mysql.sock

I execute rake db:create and I get the following error stack:

** Invoke db:create (first_time)
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
** Execute db:create
rake aborted!
uninitialized constant Mysql2
C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/active_record/railtie
s/databases.rake:81:in `rescue in create_database'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/active_record/railtie
s/databases.rake:54:in `create_database'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.1.3/lib/active_record/railtie
s/databases.rake:42:in `block (2 levels) in <top (required)>'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in
`call'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in
`block
in execute'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in
`each'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in
`execut
e'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:158:in
`block
in invoke_with_call_chain'
C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in
`invoke
_with_call_chain'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:in
`invoke
'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:116:in`invoke_task'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:94:in
`block (2 levels) in top_level'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:94:in
`each'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:94:in
`block in top_level'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:133:in`standard_exception_handling'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:88:in
`top_level'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:66:in
`block in run'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:133:in`standard_exception_handling'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-.9.2.2/lib/rake/application.rb:63:in
`run'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `<top
(required)>'
C:/Ruby192/bin/rake:19:in `load'
C:/Ruby192/bin/rake:19:in `<main>'
Tasks: TOP => db:create

Is it a missing gem?

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