Premature end of script headers

What does this mean?

[physics]

I'm trying to run a .cgi on my server but I get a 500 error. The permissions are wide open and I've checked the script... it looks good. It's pretty simple too, just takes in some text and then outputs a page. I got this error message from the apache error logs. Any pointers would be great, thanks!

[littleman]

physics, a 500 error is wide open. It could be your path to perl or a number of other things. The easiest way to debug a script is to try to run it via command line or dos prompt. You could download perl for window at activestate.com

[Cyborg]

You may run:
perl.exe script.cgi
without apache, and it out string with error data.