Unknown errir

:( ?!?

This error

wrong number of arguments (1 for 0)

Rails.root: /home/andrew/Documents/GRUB
Application Trace | Framework Trace | Full Trace

app/models/subscription.rb:23:in `extend_deliveries'
app/models/subscription.rb:15:in `times'
app/models/subscription.rb:15:in `extend_deliveries'
app/controllers/subscriptions_controller.rb:11:in `roll_subscriptions'
app/controllers/subscriptions_controller.rb:10:in `each'
app/controllers/subscriptions_controller.rb:10:in `roll_subscriptions'


# app/models/subscription.rb
  def extend_deliveries
    if self.deliveries.empty?
      delivery_date = DateProcess.getLast(self.weekday)
    else
      delivery_date = self.deliveries.last.date
    end
    4.times do  # extends for 4 more deliveries
      delivery_date += self.interval.days
      Delivery.create(:user_id => self.user_id, :box_id => self.box_id, :subscription_id => self.id, :date => delivery_date.to_date) # this is line 23
    end
  end

# app/controllers/subscriptions_controller.rb

  def roll_subscriptions
    session[:return_to] ||= request.referer
    Subscription.all.each do |subscription|
      subscription.extend_deliveries
    end
    flash[:notice] = "subscriptions rolled forward!"
    redirect_to session[:return_to]
  end