Can't load Nokogiri gem when running a .rb file from a text editor, but it works fine in the Ruby command shell

I use Scintilla Text Editor and Sublime Text 2.

Whenever I use them to run a Ruby script containing:

require 'nokogiri'

...I get this error:

C:/Program Files (x86)/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': no such file to load -- nokogiri (LoadError)
from C:/Program Files (x86)/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from C:/Users/MY_RUBY_SCRIPT.rb:3:in `<main>'

I'm using Ruby 1.9.3 and I made sure to require rubygems, but I still got the error.

However, when I run the script from the Command Prompt With Ruby, the script works fine.

Does anyone know why the script fails in text editors, but not in the Command Prompt?

Solution

Turns out I had both Ruby 1.9.2 and 1.9.3 installed, which caused the conflict in SciTE, which was trying to find the gem in Ruby 1.9.2 instead of 1.9.3. I uninstalled 1.9.2 and the script worked fine. If I do need 1.9.2 in the future, I suppose I'll have to learn RVM.