rspec 'no such file to load'

Question

I have an annoying problem whereby the rspec gem is installed on my machine but when I require it, I get a 'no such file to load' error. The trace is listed shown below. The problem also seems to go away on rare occasions and come back soon after. Any help would be greatly appreciated. I am using IronRuby but the same seems happen in Ruby.

   C:\Users\MicalM02>igem list

   *** LOCAL GEMS ***

   builder (3.0.0)
   ci_reporter (1.7.0)
   cucumber (0.6.3)
   diff-lcs (1.1.3)
   iron-term-ansicolor (0.0.3)
   json_pure (1.7.3)
   polyglot (0.3.3)
   rake (0.9.2.2)
   rspec (2.11.0)
   rspec-core (2.11.0)
   rspec-expectations (2.11.1)
   rspec-mocks (2.11.1)
   term-ansicolor (1.0.7)
   treetop (1.4.10)

   C:\Users\MicalM02>ir
   IronRuby 1.1.3.0 on .NET 4.0.30319.269
   Copyright (c) Microsoft Corporation. All rights reserved.

   >>> require "rubygems"
   => true
   >>> require "spec/expectations"
    d:/Program Files (x86)/IronRuby 1.1/Lib/ruby/1.9.1/rubygems/custom_require.rb:29
    :in `require': no such file to load -- spec/expectations (LoadError)
            from d:/Program Files (x86)/IronRuby 1.1/Lib/ruby/1.9.1/rubygems/custom_
    require.rb:29:in `require'
           from (ir):1

    >>>

Answer 1

It is: require "rspec/expectations"

You are missing an "r"