Errormessage 500 in guestbook.pl

Hi there,

I suggessfully installed the regular guestbook under http://www.campingclub-weiss-blau-muenchen.de/book/guestbook.html . As soon as I go to the "admin" section or what to write an entry, I get this Error 500 message:

Premature end of script headers: guestbook.pl

The guestbook.pl is like this on the server:

#!/usr/bin/perl
# url of script
$cgiurl = "http://localhost/cgi-bin/guestbook.pl";
# administration password
$admin_pass = "123";
# base url to all guestbook files without trailing "/"
$bookurl = "http://localhost/book";
# base directory to all guestbook files from the server root without trailing "/"
$base_dir = "/home/usr/you/book";

What do I have to change that it works ?

I'm not that firm with .pl Scripts

1000 thanks, Nicole