RUby on Rails Server not Starting 4

This is the error that i am getting

C:\Users\talhaa\talha\hello_app>rails server

C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.4-x64-mingw32/lib/nokogiri .rb:29:in require': cannot load such file -- nokogiri/nokogiri (LoadError) from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.4-x64-mingw32 /lib/nokogiri.rb:29:inrescue in ' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/nokogiri-1.6.6.4-x64-mingw32 /lib/nokogiri.rb:25:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/loofah-2.0.3/lib/loofah.rb:3 :inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/loofah-2.0.3/lib/loofah.rb:3 :in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rails-html-sanitizer-1.0.2/l ib/rails-html-sanitizer.rb:2:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rails-html-sanitizer-1.0.2/l ib/rails-html-sanitizer.rb:2:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/sanitize_helper.rb:3:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/sanitize_helper.rb:3:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/text_helper.rb:32:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/text_helper.rb:29:in <module:Helpers>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/text_helper.rb:6:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/text_helper.rb:4:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/form_tag_helper.rb:18:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/form_tag_helper.rb:14:in <module:Helpers>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/form_tag_helper.rb:8:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/form_tag_helper.rb:6:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/form_helper.rb:4:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers/form_helper.rb:4:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers.rb:50:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers.rb:4:in <module:ActionView>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.2/lib/action_ view/helpers.rb:3:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/legacy_asset_tag_helper.rb:7:in <module:LegacyAssetTagHelper>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/legacy_asset_tag_helper.rb:6:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/legacy_asset_tag_helper.rb:4:in <module:Sprockets>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/legacy_asset_tag_helper.rb:3:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/helper.rb:45:in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/helper.rb:45:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/helper.rb:7:in <module:Rails>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/helper.rb:6:in' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/rails/helper.rb:5:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/railtie.rb:6:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sprockets-rails-2.3.3/lib/sp rockets/railtie.rb:6:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.2/lib/sass/ra ils/railtie.rb:3:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.2/lib/sass/ra ils/railtie.rb:3:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.2/lib/sass/ra ils.rb:11:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.2/lib/sass/ra ils.rb:11:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.2/lib/sass-ra ils.rb:1:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/sass-rails-5.0.2/lib/sass-ra ils.rb:1:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/r untime.rb:76:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/r untime.rb:76:in block (2 levels) in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/r untime.rb:72:ineach' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/r untime.rb:72:in block in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/r untime.rb:61:ineach' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/r untime.rb:61:in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler.r b:134:inrequire' from C:/Users/talhaa/talha/hello_app/config/application.rb:7:in <top (r equired)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.2/lib/rails/com mands/commands_tasks.rb:78:inrequire' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.2/lib/rails/com mands/commands_tasks.rb:78:in block in server' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.2/lib/rails/com mands/commands_tasks.rb:75:intap' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.2/lib/rails/com mands/commands_tasks.rb:75:in server' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.2/lib/rails/com mands/commands_tasks.rb:39:inrun_command!' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.2/lib/rails/com mands.rb:17:in <top (required)>' from bin/rails:4:inrequire' from bin/rails:4:in `'