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# No Such Nick/Channel
The No Such Nick/Channel error (401, ERR_NOSUCHNICK in [RFC 1459](https://datatracker.ietf.org/doc/html/rfc1459#section-6.1)) is when the client tries to send a message or alter (the modes) of a user or channel that doesn't exist.
```
↙️ :foo!ident@host QUIT :foo
↗️ PRIVMSG foo :This is a very cool message
↙️ :server 401 nick foo :No such nick/channel
