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

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:inmodule: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:inrequire’
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:inclass: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:inblock (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:inblock 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:inrequire’
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:inblock 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:inserver’
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.

Try following:

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

2015-09-04 22:42 GMT+06:00 Zaid I. [email protected]:

C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/actionview-4.2.4/lib/action_view/helpers.rb:3:in

web_console/template.rb:6:in <module:WebConsole>'require’
`each’
from
from
I’m running on Windows.
.
For more options, visit https://groups.google.com/d/optout.


Md. Sadaf N. (@sadaf2605 https://twitter.com/sadaf2605)
www.sadafnoor.com

This problem has been fixed.
Here is the solution: http://stackoverflow.com/a/32412231/5303368

Thank you.

On 4 September 2015 at 17:42, Zaid I. [email protected]
wrote:

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

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

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