generate activerecord error message

[Martin Hawkins]

Hi, I've just started taking a look at this as I'm hoping it will
allow me to get further with activerecord.
I have rubycocoa 0.13.2 installed.
I've installed the rucola gem and run a generation as follows:
ruby script/generate activerecord_model Author
exists app/models
create db/migrate
exists config
create app/models/author.rb
create app/models/author_proxy.rb
create config/database.yml
exists db/migrate
uninitialized constant RubiGen::Commands::Base::ActiveRecord

Any guidance as to what is breaking most appreciated.