Find and kill process locking a port on Mac

This error was caused when I tried to locally run a server on a port that was already being used by another server that I had previously left running and forgot to turn off.

This command will show you all the process(es) running on a port and their PIDs

sudo lsof -i :3000

Kill the process by replacing <PID> with the process’ PID number

kill -9 <PID>

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