Plugins with lib not working

Hi

I tried installing both acts_as_list and token_generator plugin, and
it seems to work, except when I try to use something from the plugin
the functions can't be found:

undefined method `generate_token' for #<TestController:0x7f359c4adc28>

The tztime plugin did work, but that plugin does not install anything
into vendor/plugins. So is there something wrong with my lib path or
something? And where do I find out about where the program is
searching for lib paths?

Thanks

Turns out I didn't have irb installed. So I just told Ubuntu to
install irb and all these problems went away.