我收到以下错误(在我将magento从一台服务器移动到另一台服务器后)"Cannot send headers; headers already sent in /home/user/public_html/lib/Varien/Event/Collection.php, line 1";#0 /home/user/public_html/lib/Zend/Controller/Response/Abstract.php(114): Zend_Controller_Response_Abstract->