No script/console

Hey,
  I was having problems which I though might be related to the version
of rails I had so I deleted rails in the /vendor folder. My app works
fine but I get this error when trying to go to console:

Loading development environment (Rails 2.1.0)
sh: irb: not found

Any ideas?

Hey,
I was having problems which I though might be related to the version
of rails I had so I deleted rails in the /vendor folder. My app works
fine but I get this error when trying to go to console:

Loading development environment (Rails 2.1.0)
sh: irb: not found

Dumn question, is irb installed? If not, install it (it's an optional
install on some distros).

Fred