I have a Rakefile that looks like this:

```
require 'rspec/core/rake_task'

desc "Run all RSpec tests"
RSpec::Core::RakeTask.new(:spec)

```

This isn't working though. For example, if I try to run "rake -T", I get:

```
code/projects/bellybuster[master]% rake -T --trace
(in /Users/craig/code/projects/bellybuster)
rake aborted!
no such file to load -- rspec/core/rake_task
/Users/craig/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/craig/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/craig/code/projects/bellybuster/Rakefile:1:in `<top (required)>'
/Users/craig/.rvm/gems/ruby-1.9.2-p180/gems/rake-0.8.7/lib/rake.rb:2383:in `load'

```

Any thoughts?

In case it might be helpful here's the Gemfile:

```
source :rubygems

gemspec

```

Oh and some versions:

* Ruby: 1.9.2p180
* Rake: 0.8.7
* Bundler: 1.0.13
* RubyGems: 1.7.2