请教 openwebmail实验的时候出现的错误

openwebmail实验的时候出现的错误如下;已经成功实现登陆界面,但是用户登陆后就提示如下的内容
错误误提示:
Server error!
The server encountered an internal error and was unable to complete your request.
Error message:
Premature end of script headers: openwebmail-main.pl
If you think this is a server error, please contact the webmaster
Error 500
mail.zong.com
2007?ê09??16è? D??úè? 12ê±04•?08??
Apache/2.0.40 (Red Hat Linux)