@nickywan123 Eh, I wouldn't worry about it. I have two Macs and noticed this command always says things have errors. Does PHP work? Nginx? Then who cares what this command says. If anyone has better advice, I'd love to know how to fix these things as it triggers my OCD as well... but I can develop and everything works regardless of what Brew says. So... ¯\_(ツ)_/¯
This thread is interesting: https://github.com/Homebrew/homebrew-services/issues/92
Apparently a common cause of this is just the Mac launchd service losing track of the PID, which is pretty meaningless functionality-wise.