Looking at this repo and auto says:
Make sure to edit your host file
127.0.0.1 * http://localhost:3001
What does that mean?
If you are on a Unix system the file is at /etc/hosts - you will need to be root to edit this.
On Windows it is at C:\Windows\system32\drivers\etc\hosts or something like that.
Basically your hosts file is local a local Domain Naming System (DNS) - it's convenient to be able to find ip addresses that are local to your network that the public DNS can't know about