Check your web server's error logs. Failing that, try to run the script by hand. The error message you're describing is consistent with the script failing to compile or execute, or perhaps it's abending early in its execution if it can't find a particular file or database connection. In all of these cases, the script should produce error message output that should be reflected in your server's error logs like any other CGI problem.

We will need more information in order to help you any further than this.