Redcar redcar

I installed through gems, a command promt flashes, then nothing.

C:\Sites>redcar
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/lib/redcar.rb:3
2: Use RbConfig instead of obsolete and deprecated Config.
Redcar 0.13 ( i386-mingw32 )
javaw -Xbootclasspath/a:C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/red
car-jruby-0.1/vendor/jruby-complete-1.6.4.jar -Dfile.encoding=UTF8 -Xmx320m -Xss
1024k -Djruby.memory.max=320m -Djruby.stack.max=1024k org.jruby.Main "C:/RailsIn
staller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/bin/redcar" --no-sub-jrub
y --ignore-stdin --start-time=1337660402 && echo 'finished'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/lib/redcar/runn
er.rb:44:in `exec': No such file or directory - javaw -Xbootclasspath/a:C:/Rails
Installer/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-jruby-0.1/vendor/jruby-compl
ete-1.6.4.jar -Dfile.encoding=UTF8 -Xmx320m -Xss1024k -Djruby.memory.max=320m -D
jruby.stack.max=1024k org.jruby.Main "C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/
1.9.1/gems/redcar-0.13/bin/redcar" --no-sub-jruby --ignore-stdin --start-time=13
37660402 && echo 'finished' (Errno::ENOENT)

    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/li

b/redcar/runner.rb:44:in `block in run'

    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/li

b/redcar/runner.rb:75:in `construct_command'

    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/li

b/redcar/runner.rb:43:in `run'

    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/li

b/redcar.rb:100:in `spin_up'

    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/redcar-0.13/bi

n/redcar:27:in `'

    from C:/RailsInstaller/Ruby1.9.3/bin/redcar:19:in `load'
    from C:/RailsInstaller/Ruby1.9.3/bin/redcar:19:in `<main>'

Thanks.