How to use Rjb on Windows 7?

My OS is Windows 7.
My Ruby version is ruby 1.9.2p290 (2011-07-09) [i386-mingw32]

I have downloaded rjb-1.3.5-x86-mswin32-60.gem from RubyForge and
install it

gem install rjb-1.3.5-x86-mswin32-60.gem --local

No error messages, the installation succeeded.

However, when I write in a script

require ‘rjb’

it doesn’t work, the error messages are:

report_activate_error': RubyGem version error: rjb(1.3.5 not >= 0) (Gem::LoadError) from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems.rb:244:inactivate_dep’
from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems.rb:236:in activate' from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems.rb:213:inrescue in
from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems.rb:210:in
try_activate' from <internal:gem_prelude>:218:intry_activate’
from internal:lib/rubygems/custom_require:32:in rescue in require' from <internal:lib/rubygems/custom_require>:29:inrequire’
from y.rb:1:in `’

How can I do?

Thank you!

maybe compile it yourself?