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我正在使用activemerchant并且在验证卡在rails 3中是否正常时它会引发我的错误？先谢谢你们所有人的力量

belongs_to :reservation

  attr_accessor :card_number, :card_verification

  validate :validate_card, :on => :create

  def validate_card
    unless credit_card.valid?
      credit_card.errors.full_messages.each do |message|
        errors.add_to_base "error"
      end
    end
  end

    def credit_card
    @credit_card ||= ActiveMerchant::Billing::CreditCard.new(
      :type               => card_type,
      :number             => card_number,
      :verification_value => card_verification,
      :month              => card_expires_on.month,
      :year               => card_expires_on.year,
      :first_name         => first_name,
      :last_name          => last_name
    )
  end

它指向 Undefined method add_to_base