Setting up Ruby on Rails on IIS

Hi,

I am new to Ruby on Rails. I have an existing website that I need to configure on IIS. I installed Ruby Hosting package from Web Platform Installer. When I ran the website, I got the following error.

Error
Helicon Zoo module has caught up an error. Please see the details below.
Worker Status
The process was created
Windows error
The pipe has been ended. (ERROR CODE: 109)
Internal module error
message: Application backend read Error.
type: ZooException
file: App\Jobs\JobBase.cpp
line: 531
version: 3.1.98.538
STDERR
[tid-5491068] Couldn't run bundler/setup: cannot load such file -- bundler/setup (String)
[tid-5491068] cannot load such file -- rack (LoadError)
C:/Zoo/Workers/ruby/lib/app.rb:84:in eval'
C:/Ruby19/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:inrequire'
(eval):1:in assure_rack'
C:/Zoo/Workers/ruby/lib/app.rb:84:ineval'
C:/Zoo/Workers/ruby/lib/app.rb:84:in assure_rack'
C:/Zoo/Workers/ruby/lib/app.rb:23:inbuild_app'
C:/Zoo/Workers/ruby/lib/app.rb:16:in initialize'
C:/Zoo/Workers/ruby/lib/worker.rb:4:innew'
C:/Zoo/Workers/ruby/lib/worker.rb:4:in initialize'
C:/Zoo/Workers/ruby/zoorack.rb:30:innew'
C:/Zoo/Workers/ruby/zoorack.rb:30:in <module:Zack>'
C:/Zoo/Workers/ruby/zoorack.rb:12:in

Any idea on how to fix this?

Thanks.