Error when running 'ruby script\generate controller pages'

Hi,

I have just upgraded rails to version 1.2.2, however whenever I got to
generate a controller I get the following error, any ideas?
(im uisng instant rails on a windows)

C:\InstantRails\rails_apps\uni>ruby script\generate controller pages
./script/…/config/boot.rb:29: undefined method `gem’ for main:Object
(NoMethodE
rror)
from script/generate:2

thanks
Scot