我有一个带有以下文件的〜/ Projects文件夹：
bowling.rb＆amp; bowling_spec.rb
这两个文件与rspec的索引页面（http://rspec.info/）中描述的文件相同，以便测试gem。
当我尝试执行bowling_spec.rb时，我收到以下消息：
ak@ak-ku:~/Projects$ rspec bowling_spec.rb
/home/ak/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- bowling (LoadError)
from /home/ak/.rvm/rubies/ruby-2.0.0-p481/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /home/ak/Projects/bowling_spec.rb:1:in `<top (required)>'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/configuration.rb:1051:in `load'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/configuration.rb:1051:in `block in load_spec_files'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/configuration.rb:1051:in `each'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/configuration.rb:1051:in `load_spec_files'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/runner.rb:97:in `setup'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/runner.rb:85:in `run'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/runner.rb:70:in `run'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/lib/rspec/core/runner.rb:38:in `invoke'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/gems/rspec-core-3.0.1/exe/rspec:4:in `<top (required)>'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/bin/rspec:23:in `load'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/bin/rspec:23:in `<main>'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/bin/ruby_executable_hooks:15:in `eval'
from /home/ak/.rvm/gems/ruby-2.0.0-p481/bin/ruby_executable_hooks:15:in `<main>'
我该怎么办？为什么这不起作用？
我在Kubuntu的rvm 1.25.27下使用ruby 2.0.0p481。 Rails是4.1.1，我今天安装了所有东西。