nostr:npub1h73s7j2mdwzzv6a2fm9tfjchlaw4r7a59pfl0keqrahfja2k3stq4s8pv9 nostr:npub1fmhk33ta7scnlmhdur3xvju4w29qlc0kare9pkqupt2efe4lae8qashpey "Descriptive error messages" is a new one for me. Give an example?