Exactly the same problem here (Ubuntu 7.04, Ruby 1.8.5, Rails 1.2.1). Fix needed seems to be two things:

• "recipes" not "Recipes"


• :string no "string"



i.e.:

class AddContributorName < ActiveRecord::Migration
def self.up
add_column("recipes", "contributor_name", :string, :default => "Unknown")
end


def self.down
remove_column("recipes", "contributor_name")
end
end