ruby on rails - Please install mysql2 adapter -


i'm new of rails, , have big problem. i'm running rails 3.2.9 , ruby 1.9.3, did porting of rails app linux windows, in windows i'm having lot of problems mysql2 gem. installed mysql2 gem yesterday , tried run rake db:migrate have output:

rake aborted!
please install mysql2 adapter: gem install activerecord-mysql2-adapter (cannot load such file -- mysql2)
c:/users/roccaa/desktop/project/config/environment.rb:5:in `'
tasks: top => db:migrate => environment
(see full trace running task --trace)

then gemfile

gem 'rails', '3.2.9' # bundle edge rails instead: # gem 'rails', :git => 'git://github.com/rails/rails.git' #gem 'sqlite3' # gems used assets , not required # in production environments default. group :assets   gem 'sass-rails',   '~> 3.2.3' #  gem 'coffee-rails', '~> 3.2.1'   # see https://github.com/sstephenson/execjs#readme more supported runtimes   # gem 'therubyracer', :platforms => :ruby  # gem 'uglifier', '>= 1.0.3' end  gem 'coffee-rails', '~> 3.2.1'  gem 'uglifier', '>= 1.0.3' gem 'jquery-rails' # use activemodel has_secure_password # gem 'bcrypt-ruby', '~> 3.0.0' # use jbuilder templates json # gem 'jbuilder' # use unicorn app server # gem 'unicorn' # deploy capistrano # gem 'capistrano' # use debugger # gem 'debugger' # gems needs auth gem 'cancan' gem 'devise' gem 'rolify' gem 'execjs' gem 'therubyracer', :platform => :ruby gem 'populator' gem 'faker' gem 'paperclip' gem 'simple_xlsx_writer' gem 'roo' gem 'mysql2', '0.3.11' gem 'simple_xlsx_writer' gem 'rake', '~> 10.0.4' gem 'icalendar'

and database.yml

development:    adapter: mysql2   encoding: utf8   reconnect: false   database: emc   pool: 5   username: root   password: root   socket: /var/run/mysqld/mysqld.sock testing:    adapter: mysql2   encoding: utf8   reconnect: false   database: emc   pool: 5   username: root   password: root   socket: /var/run/mysqld/mysqld.sock production:    adapter: mysql2   encoding: utf8   reconnect: false   database: emc   pool: 5   username: root   password: root   socket: /var/run/mysqld/mysqld.sock

i tried solve problem in lots of ways, read have use mysql2 version < 0.3 version have output

warning: version of mysql2 (0.2.18) isn't compatible rails 3.1 activerecord adapter pulled rails itself.
warning: please use 0.3.x (or greater) releases if plan on using in rails >= 3.1.x
rake aborted!
undefined method `accept' nil:nilclass
tasks: top => db:migrate
(see full trace running task --trace)**

hope can me, thanks.

try gemfile

instead of using:

gem 'mysql2', '0.3.11'

use this:

gem 'mysql2'

this working me.

and way have duplicate gem

gem 'simple_xlsx_writer'

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