ruby - when i try to start a rails server, i get an error -

this error

c:\users\Евгений\silmple_cms2>rails server c:/users/Евгений/silmple_cms2/config/application.rb:7:in `<top (required)>': uni nitialized constant bundler (nameerror)         c:/ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_req uire.rb:54:in `require'         c:/ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_req uire.rb:54:in `require'         c:/ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.3/lib/rails/com mands/commands_tasks.rb:78:in `block in server'         c:/ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.3/lib/rails/com mands/commands_tasks.rb:75:in `tap'         c:/ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.3/lib/rails/com mands/commands_tasks.rb:75:in `server'         c:/ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.3/lib/rails/com mands/commands_tasks.rb:39:in `run_command!'         c:/ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.3/lib/rails/com mands.rb:17:in `<top (required)>'         c:/ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_req uire.rb:128:in `require'         c:/ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_req uire.rb:128:in `rescue in require'         c:/ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_req uire.rb:39:in `require'         bin/rails:4:in `<main>'  c:\users\Евгений\silmple_cms2> 

seems bundler not present. before starting server, try:

gem install bundler 

followed by:

rails server 

incase bundler present, clear bundler specific settings , caches:

rm -rf .bundle/ rm -rf vendor/ rm -rf gemfile.lockcache/