You can search on how to kill that process.
For Linux/Mac OS search (sudo) run this in the terminal:
$ lsof -i tcp:3000
$ kill -9 PID
On Windows:
netstat -ano | findstr :3000
tskill typeyourPIDhere
change tskill for taskkill in git bash
You can search on how to kill that process.
For Linux/Mac OS search (sudo) run this in the terminal:
$ lsof -i tcp:3000
$ kill -9 PID
On Windows:
netstat -ano | findstr :3000
tskill typeyourPIDhere
change tskill for taskkill in git bash