You need to check your web error log for the rest of the error messages. I am guessing that you violated a strict policy since commenting out that line makes your script work. The problem could also be in one of the scripts that you are requireing.

You should check out the requirements that use strict entails. You might also want to check out the -T (taint) option for Perl since you are doing CGI.

Basically, you didn't provide us enough information to diagnose your problem. Either check your error log or run the script from the command line for the details.