title: Could not find gem 'rails (= 4.2.5.2) x86-mingw32' in any of the gem sources listed in your Gemfile or available on this machine
body: <p>I am getting the error </p>
  
  <pre><code> Could not find gem 'rails (= 4.2.5.2) x86-mingw32' in any of the gem sources listed in your Gemfile or available on this machine." 
  </code></pre>
  
  <p>when I try to run the command <strong>rake generate_secret_token</strong></p>
  
  <p>Output of <strong>gem environment</strong></p>
  
  <pre><code>RubyGems Environment:
  
      - RUBYGEMS VERSION: 2.2.5
      - RUBY VERSION: 2.1.8 (2015-12-16 patchlevel 440) [i386-mingw32]
      - INSTALLATION DIRECTORY: C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0
      - RUBY EXECUTABLE: C:/RailsInstaller/Ruby2.1.0/bin/ruby.exe
      - EXECUTABLE DIRECTORY: C:/RailsInstaller/Ruby2.1.0/bin
      - SPEC CACHE DIRECTORY: C:/Users/Souvik Banerjee/.gem/specs
      - RUBYGEMS PLATFORMS:
      - ruby
      - x86-mingw32
  
  GEM PATHS:
  
      - C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0
      - C:/Users/Souvik Banerjee/.gem/ruby/2.1.0
  
  GEM CONFIGURATION:
  
      - :update_sources =&gt; true
      - :verbose =&gt; true
      - :backtrace =&gt; false
      - :bulk_threshold =&gt; 1000
  
  REMOTE SOURCES:
  
      - https://rubygems.org/
  
  SHELL PATH:
  
      - C:\ImageMagick
      - C:\ProgramData\Oracle\Java\javapath
      - C:\WINDOWS\system32
      - C:\WINDOWS
      - C:\WINDOWS\System32\Wbem
      - C:\WINDOWS\System32\WindowsPowerShell\v1.0\
      - C:\Program Files\nodejs\
      - C:\Program Files\Java\jdk1.8.0_65\bin
      - D:\apache-ant-1.9.6\bin
      - C:\Users\Souvik Banerjee\AppData\Local\Android\android-sdk\tools
      - C:\Users\Souvik Banerjee\AppData\Local\Android\android-sdk\platforms
      - C:\Program Files (x86)\Skype\Phone\
      - C:\RailsInstaller\Git\cmd
      - C:\RailsInstaller\Ruby2.1.0\bin
  </code></pre>
  
  <p>Output of <strong>gem list rails</strong></p>
  
  <pre><code>C:\Sites\redmine-3.2.1&gt;gem list rails
  
  LOCAL GEMS
  
      coffee-rails (4.1.1)
      jquery-rails (4.1.0)
      rails (4.2.6, 4.2.5.1)
      rails-deprecated_sanitizer (1.0.3)
      rails-dom-testing (1.0.7)
      rails-html-sanitizer (1.0.3)
      sass-rails (5.0.4)
      sprockets-rails (3.0.1)
  </code></pre>