title: MySQLproblem - RAILS_ENV=production bundle exec rake db:migrate
body: <p>I am just installing the redmine to my server due to <a href="http://www.redmine.org/projects/redmine/wiki/How_to_Install_Redmine_on_CentOS_%28Detailed%29" rel="nofollow">detailed manual</a>. Everything gone fine but one of the last step fail with some bug and I have no idea how to fix it.</p>
  
  <p>Command is </p>
  
  <pre><code>RAILS_ENV=production bundle exec rake db:migrate
  </code></pre>
  
  <p>Output error</p>
  
  <pre><code>You cannot specify the same gem twice with different version requirements. 
  You specified: mysql (&gt;= 0) and mysql (~&gt; 2.9.1)
  </code></pre>
  
  <p><strong>gem list</strong></p>
  
  <pre><code>*** LOCAL GEMS ***
  
  actionmailer (3.2.15)
  actionpack (3.2.15)
  activemodel (3.2.15)
  activerecord (3.2.15)
  activeresource (3.2.15)
  activesupport (3.2.15)
  arel (3.0.3)
  bigdecimal (1.2.0)
  builder (3.0.0)
  bundler (1.3.5)
  capybara (2.1.0)
  childprocess (0.3.9)
  coderay (1.1.0)
  daemon_controller (1.1.7)
  database_cleaner (1.2.0)
  erubis (2.7.0)
  ffi (1.9.3)
  hike (1.2.3)
  hoe (3.7.1)
  i18n (0.6.4)
  io-console (0.4.2)
  journey (1.0.4)
  jquery-rails (2.0.3)
  json (1.8.1, 1.7.7)
  mail (2.5.4)
  metaclass (0.0.1)
  mime-types (1.25.1)
  mini_portile (0.5.2)
  minitest (4.3.2)
  mocha (0.14.0)
  multi_json (1.8.2)
  mysql (2.9.1)
  net-ldap (0.3.1)
  nokogiri (1.6.0)
  passenger (4.0.25)
  polyglot (0.3.3)
  psych (2.0.0)
  rack (1.5.2, 1.4.5)
  rack-cache (1.2)
  rack-openid (1.4.1)
  rack-ssl (1.3.3)
  rack-test (0.6.2)
  rails (3.2.15)
  railties (3.2.15)
  rake (0.9.6, 0.8.7)
  rdoc (4.0.0, 3.12.2)
  RedCloth (4.2.9)
  rmagick (2.13.2)
  ruby-openid (2.3.0)
  rubygems-update (2.1.11)
  rubytree (0.5.2)
  rubyzip (1.0.0)
  selenium-webdriver (2.37.0)
  shoulda (3.3.2)
  shoulda-context (1.0.2)
  shoulda-matchers (1.4.1)
  sprockets (2.2.2)
  test-unit (2.0.0.0)
  thor (0.18.1)
  tilt (1.4.1)
  treetop (1.4.15)
  tzinfo (0.3.38)
  websocket (1.0.7)
  xpath (2.0.0)
  yard (0.8.7.3)
  </code></pre>
  
  <p><strong>Gemfile</strong></p>
  
  <pre><code>    source 'https://rubygems.org'
  
      gem "rake", "0.8.7"
      gem "rack", "1.4.5"
      gem "i18n", "0.6.4"
      gem "rubytree", "0.5.2", :require =&gt; "tree"
      gem "RedCloth", "~&gt;4.2.3", :require =&gt; "redcloth" # for CodeRay
      gem "mysql"
  
      gem "rails", "3.2.15"
      gem "jquery-rails", "~&gt; 2.0.2"
      gem "coderay", "~&gt; 1.1.0"
      gem "fastercsv", "~&gt; 1.5.0", :platforms =&gt; [:mri_18, :mingw_18, :jruby]
      gem "builder", "3.0.0"
  
      # Optional gem for LDAP authentication
      group :ldap do
        gem "net-ldap", "~&gt; 0.3.1"
      end
  
      # Optional gem for OpenID authentication
      group :openid do
        gem "ruby-openid", "~&gt; 2.3.0", :require =&gt; "openid"
        gem "rack-openid"
      end
  
      # Optional gem for exporting the gantt to a PNG file, not supported with jruby
      platforms :mri, :mingw do
        group :rmagick do
          # RMagick 2 supports ruby 1.9
          # RMagick 1 would be fine for ruby 1.8 but Bundler does not support
          # different requirements for the same gem on different platforms
          gem "rmagick", "&gt;= 2.0.0"
        end
      end
  
      platforms :jruby do
        # jruby-openssl is bundled with JRuby 1.7.0
        gem "jruby-openssl" if Object.const_defined?(:JRUBY_VERSION) &amp;&amp; JRUBY_VERSION &lt; '1.7.0'
        gem "activerecord-jdbc-adapter", "~&gt; 1.3.2"
      end
  
      # Include database gems for the adapters found in the database
      # configuration file
      require 'erb'
      require 'yaml'
      database_file = File.join(File.dirname(__FILE__), "config/database.yml")
      if File.exist?(database_file)
  
     database_config = YAML::load(ERB.new(IO.read(database_file)).result)
     adapters = database_config.values.map {|c| c['adapter']}.compact.uniq
     if adapters.any?
  
      adapters.each do |adapter|
        case adapter
        when 'mysql2'
          gem "mysql2", "~&gt; 0.3.11", :platforms =&gt; [:mri, :mingw]
          gem "activerecord-jdbcmysql-adapter", :platforms =&gt; :jruby
        when 'mysql'
          gem "mysql", "~&gt;2.9.1", :platforms =&gt; [:mri, :mingw]
          gem "activerecord-jdbcmysql-adapter", :platforms =&gt; :jruby
        when /postgresql/
          gem "pg", "&gt;= 0.11.0", :platforms =&gt; [:mri, :mingw]
          gem "activerecord-jdbcpostgresql-adapter", :platforms =&gt; :jruby
        when /sqlite3/
          gem "sqlite3", :platforms =&gt; [:mri, :mingw]
          gem "activerecord-jdbcsqlite3-adapter", :platforms =&gt; :jruby
        when /sqlserver/
          gem "tiny_tds", "~&gt; 0.5.1", :platforms =&gt; [:mri, :mingw]
          gem "activerecord-sqlserver-adapter", :platforms =&gt; [:mri, :mingw]
        else
          warn("Unknown database adapter `#{adapter}` found in config/database.yml, use 
  
      Gemfile.local to load your own database gems")
            end
          end
        else
          warn("No adapter found in config/database.yml, please configure it first")
        end
      else
        warn("Please configure your config/database.yml first")
      end
  
      group :development do
        gem "rdoc", "&gt;= 2.4.2"
        gem "yard"
      end
  
      group :test do
        gem "shoulda", "~&gt; 3.3.2"
        gem "mocha", "&gt;= 0.14", :require =&gt; 'mocha/api'
        if RUBY_VERSION &gt;= '1.9.3'
          gem "capybara", "~&gt; 2.1.0"
          gem "selenium-webdriver"
          gem "database_cleaner"
        end
      end
  
      local_gemfile = File.join(File.dirname(__FILE__), "Gemfile.local")
      if File.exists?(local_gemfile)
        puts "Loading Gemfile.local ..." if $DEBUG # `ruby -d` or `bundle -v`
        instance_eval File.read(local_gemfile)
      end
  
      # Load plugins' Gemfiles
      Dir.glob File.expand_path("../plugins/*/Gemfile", __FILE__) do |file|
        puts "Loading #{file} ..." if $DEBUG # `ruby -d` or `bundle -v`
        #TODO: switch to "eval_gemfile file" when bundler &gt;= 1.2.0 will be required (rails 4)
        instance_eval File.read(file), file
      end
  </code></pre>
  
  <p>Thank you for any answer.</p>
  
  <p>Nice day
  Jan</p>