ruby on rails - Redmine (1.4.7) error in executing server in development mode -


Using command rails s while running 1.4.7 in development mode, I get an error Has been down like 

  /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/options.rb:32:in ' Default_points ': Railway :: Generator :: Undefined method for base `write_inheritable_attribute'; Class (Nomthious error) from /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/base.rb: 90: `& lt; Category: Base & gt; /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/base.rb:85:in `& lt; From the module: Generator & gt; /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/base.rb:48:in `& lt; From the module: Railway & gt; /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/base.rb:6:in `& lt; Top (required) & gt; 'Required' from /usr/local/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:126:in /usr/local/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/ Kernel_require.rb: 126: In /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator.rb37:in `& lt; In the `requirement 'from top (required) & gt; Required 'from /usr/local/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:126:in /usr/local/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/' 'Kernel_require.rb: 126: /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/bin/rails:15:in `& lt; Top (required) & gt; From 'Required' to '/ Usr / local / bin / rails': 23: `Load' from / usr / local / bin / rails: 23:` & lt; Main & gt;

I have spent about 2 hours to fix it and have received some references from this and now I am getting this error how do I fix it ?? 

  /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/generators/applications/app/app_generator.rb:7: In `& Lt; Class: AppGenerator & gt; ': Use RbConfig instead of obsolete and excluded config /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/generators/applications/app/app_generator.rb:7 : In `& lt; Class: Epigenetrator & gt; Use '' RbConfig /usr/local/lib/ruby/gems/2.0.0/gems/rails-2.3.15/lib/rails_generator/generators/applications/app/app_generator.rb:7 instead of obsolete and deprecated config. : In `& lt; Class: Epigenetrator & gt; Use '' camelize '' undefined method for RbConfig "app" instead of obsolete and deprecated configuration:  RVM

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