Have a look at the web server's error log (or more likely, ask your SysAdmin to let you look at it.

He may not let you (a lot of them don't), but you can return the error messages to the browser using:

use CGI::Carp 'fatalsToBrowser';
[download]

See 'perldoc CGI::Carp' for further information.

--
Regards,
Helgi Briem
helgi AT decode DOT is