cannot load such file -- unicode (LoadError)

[RailsNewBie]

I'm new to RoR and working on a migration of project developed by another team.
I'm using Rails version (3.2.13) and my bundle install works successfully.
However while running "rails server", I get the error below.

Any suggestions are most appreciated.

Thanks!

-------------- rails server output --------------

C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.
13/lib/active_support/dependencies.rb:251:in `require': cannot load such file --
 unicode (LoadError)
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/fog-1
.16.0/lib/fog/aws.rb:4:in `<top (required)>'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/fog-1
.16.0/lib/fog.rb:9:in `<top (required)>'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler/runtime.rb:72:in `require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler/runtime.rb:70:in `each'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler/runtime.rb:59:in `each'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler/runtime.rb:59:in `require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundl
er-1.3.5/lib/bundler.rb:132:in `require'
        from C:/Projects/zengine1/ninja/config/application.rb:13:in `<top (requi
red)>'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railt
ies-3.2.13/lib/rails/commands.rb:53:in `require'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railt
ies-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railt
ies-3.2.13/lib/rails/commands.rb:50:in `tap'
        from C:/software/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railt
ies-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'