重复调用实例化对象

自动任务中循环定时发送邮件给不同人员时报重复调用实例化对象

报错：
[ 2017-11-16 01:40:43 ] Starting!
Fatal error: Uncaught exception 'Zend_Mail_Exception' with message 'Subject set twice' in /var/www/CFF/admin/libs/Zend/Mail.php:933
Stack trace:
#0 /var/www/CFF/admin/application/modules/product/services/Receiving.php(1986): Zend_Mail->setSubject('???????????????...')
#1 /var/www/CFF/admin/run/qcGroupReceivingAndBacklogReport.php(25): Product_Service_Receiving::addresseeEmail('2017-11-01 00:0...', '2017-11-15', 4)
#2 {main}
thrown in /var/www/CFF/admin/libs/Zend/Mail.php on line 933

源码：
$Object = new Product_Service_Receiving();
foreach ($warehouseId as $value) {
$Object->addresseeEmail($start_date, $end_dates, $value);
}
$content = iconv("UTF-8", "GBK", $content);
$mail_subject = "仓库质检组收货及积压报表 ";
$mail = Cff::setupMail();
$mail->setBodyHtml("");
$mail->addTo($email, $mail_subject);
$mail->setSubject($mail_subject);
$at = $mail->createAttachment($content);
$at->type = "application/vnd.ms-excel";
$at->disposition = Zend_Mime::DISPOSITION_INLINE;
$at->encoding = Zend_Mime::ENCODING_8BIT;
$at->filename = iconv("UTF-8", "GBK", $mail_subject . date("Y-m-d") . ".csv");
$mail->send();

解决方法：
解决实例化调用
把
$mail = Cff::setupMail();
更换为
$mail = Product_Service_ReceivingItem::setupMail();