点击提交表单按钮后，我收到以下消息。 我需要做些什么才能摆脱错误？
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/handball-profile.com/httpdocs/cucc/cuccioletto_ci/application/controllers/admin_home.php:2)
Filename: helpers/url_helper.php
Line Number: 543