Ruby on rails： - 找不到RubyGem rails（> = 0）（Gem :: LoadError）

Question

I am very new to Ruby on Rails. I installed ruby on rails on my Windows 7 using the installer in http://railsinstaller.org/ . I could create a project once and thereafter I was not (I dont know what did I do in between :-( ).

The complete errors messages are :-

On creating a new project :-

c:\Sites>rails new Tickets_Test
E:/Ashish/Ruby192/lib/ruby/1.9.1/rubygems.rb:762:in `report_activate_error': Cou
ld not find RubyGem rails (>= 0) (Gem::LoadError)
        from E:/Ashish/Ruby192/lib/ruby/1.9.1/rubygems.rb:219:in `activate'
        from E:/Ashish/Ruby192/lib/ruby/1.9.1/rubygems.rb:1065:in `gem'
        from E:/Ashish/RailsInstaller/Ruby1.8.7/bin/rails:18:in `<main>'

on just getting the version :-

c:\Sites>rails --version
E:/Ashish/Ruby192/lib/ruby/1.9.1/rubygems.rb:762:in `report_activate_error': Cou
ld not find RubyGem rails (>= 0) (Gem::LoadError)
        from E:/Ashish/Ruby192/lib/ruby/1.9.1/rubygems.rb:219:in `activate'
        from E:/Ashish/Ruby192/lib/ruby/1.9.1/rubygems.rb:1065:in `gem'
        from E:/Ashish/RailsInstaller/Ruby1.8.7/bin/rails:18:in `<main>'

Any idea why the above is happening?

EDIT

Appearently there are two command prompts :- Ruby command prompt :- and Ruby for rails command prompt (The problem is resolved using this command prompt):-

I was using ruby command prompt. Sounds like a stupid question, however, I am not sure how there are "two" command prompts?

Answer 1

I ran into a similar issues after installing heroku toolbelt. I found that heroku added the second one to my path. I removed it from the path and life seems good again!

Answer 2

You seem to have two Ruby versions in your system, 1.9.1 and 1.8.7. Rails gem seems to be installed only for one of them. I'd suggest you to remove one of these versions, and reinstall Rails.

Answer 3

If you have two Ruby versions in your system, 1.9.1 and 1.8.7, then no need to remove any. You can switch between these two Ruby versions with the help of RVM on OS X and Linux. And for Windows you can use Pik.

For further details, you can go through posts - http://rorguide.blogspot.com/2011/03/pik-rvm-tools-to-manage-multiple-ruby.html

Answer 4

Try using Pik (available at http://github.com ) to switch between the two or edit your path to include one but not the other. That's simpler.