Cloning this repo is working, but the cloned app isn't

I cloned the repo GitHub - dmonopoly/jdmedia: Media site for JDHS with
git clone git://github.com/dmonopoly/jdmedia.git
and got the app and everything. It’s an app in Rails 3, if that
matters.

Anyway, after “cd jdmedia” I find that the app doesn’t work, when I’m
sure the app should.
for example, typing rails -v or any rake command brings up this error:

undefined method `[]’ for nil:NilClass

For the rails -v command, I get this:

C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/
lockfile_parser.rb:48:in parse_source': undefined method []’ for nil:NilClass (NoMethodError)
from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/
bundler/lockfile_parser.rb:20:in send' from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/ bundler/lockfile_parser.rb:20:in initialize’

    from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/

bundler/lockfile_parser.rb:14:in each' from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/ bundler/lockfile_parser.rb:14:in initialize’

    from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/

bundler/definition.rb:43:in new' from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/ bundler/definition.rb:43:in initialize’
from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/
bundler/dsl.rb:122:in new' from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/ bundler/dsl.rb:122:in to_definition’
from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/
bundler/definition.rb:20:in build' from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/ bundler.rb:128:in definition’
from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/
bundler.rb:116:in load' from C:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/ bundler.rb:100:in setup’
from C:/Documents and Settings/David Z./workspace/mediasite/
config/boot.rb:8
from script/rails:5:in `require’
from script/rails:5

The rails -v command works in other apps I have on my machine…so
what is going on?
Thanks in advance.