VOID tells you that the bots' DNA has base pairs that do not exist as far as the parser is concerned. It's a bug, one way or another. Please upload a sim with the bot in it, or a .dbo file of the bot.
The script system is extremely simplistic, and I'd even be surprised if it still works. If you can't figure out how to kill bots with less than 1 body, it might not be possible with the scripts.