WhoIs Quesation - Question about configuring cdfree.pl

Hello everyone, I'd appreciate a bit of help configuring cdfree, as I'm useless in perl. Here's my problem:

Whenever I run the script from telnet, it works perfectly, but when I run it from my browser, it returns an Internal Server Error (500). I'm not sure what to do, and I really suck at perl Here's a blurb from the readme that may help you help me

Place the cdfree.pl file in your /cgi-bin directory or equivalent. Make
sure your web server or your NT operating system knows to launch your
version of Perl when it sees a .pl extension. UNIX people need to set the
file to be executable (chmod +x) and MAKE SURE THE TOP LINE OF THE SCRIPT
POINTS TO THE LOCATION OF PERL5.

The HTML files contained in this distribution are OPTIONAL and included
only as examples. CdomainFree prints its own forms.

When you are ready to try CdomainFree, simply call it and it will print
a lookup form. If you have any problems calling CdomainFree or using the
Whois Output function, try setting the $SCRIPT variable in the cdfree.pl
file. There are two ways of searching with CdomainFree. One is called
the "tld lookup", and that is the default. Using the TLD lookup, the
user enters in the second level domain and checks off the TLD from a
list (ie, enter "netscape" and then check-off ".com").

The second form is called the "root lookup". This allows the user to enter
the domain and its TLD as it would naturally appear (i.e., netscape.com).
Please try them both to see which one you prefer.

To get the "TLD Lookup" simply call CdomainFree, i.e.,
http://www.yourdomain.com/cgi-bin/cdfree.pl.

To get the "Root Lookup" call CdomainFree as follows:
http://www.yourdomain.com/cgi-bin/cdgree.pl?root_allowed=1

Thanks in advance for any help youcan offer!!