Crashing when install rails

This is the second time that I have got the following error when
running gem install rails --include-dependencies

Bulk updating Gem source index for:
Successfully installed rails-1.2.2
Successfully installed rake-0.7.2
Successfully installed activesupport-1.4.1
Successfully installed activerecord-1.15.2
Successfully installed actionpack-1.13.2
Successfully installed actionmailer-1.3.2
Successfully installed actionwebservice-1.2.2
Installing ri documentation for rake-0.7.2…
Installing ri documentation for activesupport-1.4.1…
Installing ri documentation for activerecord-1.15.2…
Installing ri documentation for actionpack-1.13.2…

lib/action_controller/routing.rb:1061:30: ‘:’ not followed by
identified or operator

When I run it again hoping that it will fix itself all I get is this
chris@chris-laptop:~$ sudo gem install rails --include-dependencies
Successfully installed rails-1.2.2

but of course it doesn’t work, but doesn’t seem to recognize that the
install was unsuccessful.

And what is the best way to remove all the installed files to do it
again. I did mention this is the second time, and the first time is
kinda fuzzy since I did so many things that somehow in the end worked

disregard this. I didn’t realize it was only having problems with the
documentation for the actionpack