Keep getting "Missing these required gems" error


I just switched from jruby 1.1.3 to jruby 1.1.6 and I keep getting the
error “Missing these required gems:” even after I have run the the
command “jruby -S rake gems:install” and the all the needed config.gem
entries in environment.rb. Also the gems listed as missing are installed
again when I run the rake target. Do I need do some cleanup to fix this
problem? This is on windows XP.