Cannot boot server. 'uninitialized constant ActionView::Helpers::ActiveModelHelper (NameError)'

rubyonrails-talk
1

I created an app but whenever I run rails server

``

It gives me the following error :in <module:Helpers>': uninitialized constant ActionView::Helpers::ActiveModelHelper (NameError) from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.4/lib/action_view/helpers.rb:4:in module:ActionView’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.4/lib/action_view/helpers.rb:3:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.4/lib/action_view/base.rb:5:in require’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.4/lib/action_view/base.rb:5:in <top (required)>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console/template.rb:7:in class:Template’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console/template.rb:6:in <module:WebConsole>' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console/template.rb:1:in <top (required)>’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console.rb:12:in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web_console.rb:12:in <top (required)>’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web-console.rb:1:in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/web-console-2.2.1/lib/web-console.rb:1:in <top (required)>’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.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/runtime.rb:72:in each' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in block in require’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in each' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in require’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.10.6/lib/bundler.rb:134:in require' from C:/Users/xyz/Documents/Sites/simples_cms/config/application.rb:7:in <top (required)>’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:78:in require' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:78:in block in server’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:75:in tap' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:75:in server’ from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:39:in run_command!' from C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/railties-4.2.4/lib/rails/commands.rb:17:in <top (required)>’ from bin/rails:4:in require' from bin/rails:4:in ’

``

Can anybody help me fix this error and boot up WeBrick? I’m running on Windows.

2

Try following:

  1. Reinstall actionview gem
  2. Switching to ruby 2.0 version.
3

Googling for the error message finds a number of hits that look as if they might be relevant. Have a look through those and let us know if any are helpful.

https://www.google.com/search?client=ubuntu&channel=fs&q=uninitialized+constant+ActionView%3A%3AHelpers%3A%3AActiveModelHelper&ie=utf-8&oe=utf-8&gl=uk

Colin

4

This problem has been fixed. Here is the solution: ruby - WeBrick does not bootup, gives an error white accessing new rails app - Stack Overflow

Thank you.