请大家看一下为什么我调用的ActionMailer总是说方法未定义那

我的运行环境是rails 1.2.5 actionmailer 是1.3; 我用 ./script/generate mailer FinanceMailer alert_customer_balance 的命令生成了相应的程序；

class FinanceMailer < ActionMailer::Base

  def alert_customer_balance(sent_at = Time.now)
    @subject    = 'FinanceMailer#alert_customer_balance'
    @body       = {}
    @recipients = '[e-mail]'
    @from       = '[e-mail]'
    @sent_on    = sent_at
    @headers    = {}
  end
end 

然后我写了一段用命令行调用代码如下：

require File.expand_path(File.dirname(__FILE__) + "/../config/environment")

if __FILE__ == $0
	FinanceMailer.alert_customer_balance()
end

但是我运行这段代码总是有这个问题：
D:\ruby-projects\adwords\jobs>ruby daily_finance_alert.rb
D:/ruby-projects/adwords/config/boot.rb:20:Warning: Gem::SourceIndex#search supp
ort for String patterns is deprecated
c:/ruby/lib/ruby/gems/1.8/gems/actionmailer-1.3.5/lib/action_mailer/base.rb:335:
in `method_missing': undefined method `alert_customer_balance' for FinanceMailer
:Class (NoMethodError)
        from daily_finance_alert.rb:4

请问这个是怎么回事，我直接用methods的把所有的方法打印出来，也的确没有看见alert_customer_balance的方法，请问是哪里初始化有问题那？