Выдвет ошибку

main.rb

require_relative 'drink'
require_relative 'purchase'

coce = Drink.new("CocaCola", "CC", 1.50)
pepsi = Drink.new("PepsiCola", "PC", 2.00)
water = Drink.new("Water", "WA", 0.85)

def drink_busket
  puts "Write list of your drinks as it show in Example"
  puts "Example: CC PC WA CC"
  drink_array = gets.chomp.split(" ")
  drink_hash = drink_array.inject(Hash.new(0)) {|drink,count| drink[count] += 1; drink }
  puts drink_hash
  drink_hash.to_a.each {|drink, count| puts "#{drink}: #{count}"}
  drink_hash.to_a.each do |drink, count|
    i = Purchase.new(drink, count.to_i)
  end
end

drink_busket