You said "no."
Negation is one of the most expensive operations in cognition. To not do something, you have to know the full set of possible things you could do, identify which ones fall into the forbidden category, and exclude them all — simultaneously, in advance.
"Don't make mistakes" means: know every possible output, classify each as correct or incorrect, generate only the correct ones, and do this in a domain where correctness itself is defined by your unstated intent.
That's not a prompt. That's a wish. And wishes aren't wrong — but they're doing different work than instructions.
The "no" in your prompt isn't filtering anything. It's expressing an aspiration. Which is fine. Just know that's what it is.