Sababa on Nostr: Questions: Why do some zaps say error request when trying to zap others ⚡️ ...

Questions:
Why do some zaps say error request when trying to zap others ⚡️ ⚡️⚡️⚡️⚡️
And is it zap and like?
Like or zap ⚡️
or comment and zap,
no zap and comment?
Learning #zap etiquette. Is there zap ⚡️ etiquette?? What say you #nostr OGs. #asknostr