网站在本地调试正常，上传服务器后，前台正常，后台输入用户名密码后点击登陆又返回登陆界面，查看日志显示：
session_start(): Cannot send session cache limiter - headers already sent (output started at /data/home/htdocs/sxdt/App/Common/Conf/config.php:1)
Cannot modify header information - headers already sent by (output started at /data/home/htdocs/sxdt/App/Common/Conf/config.php:1)
请问各位老师如何解决？