This bug has been around for a while and hasn't been fixed. I'm writing this here where hopefully someone with the ability to fix it will see it.

Whenever you make an infinite loop in the processing.js environment, for example: 

while (true) {}

OhNoes won't give an explanation of what's wrong but will instead say "%(typeMessage)s Perhaps you have a mistake in your code?"

This error message is really confusing to newer programmers. It needs to be fixed so that people aren't left wondering what's wrong with their code.