@francombat – Thanks for your patience with this!
I’m sorry that you’re having issues getting a site created in Local, but let’s see if we can get you up and running!
I know that there’s a lot of noise in this topic now that I’ve consolidated the various replies into one place. Please use only this topic while getting to the bottom of this issue
First off, were you able to take a look at afragen’s question:
Zooming out a bit, usually the Hosts file is locked due to some sort of security setting or antivirus software. You might take a look and temporarily disable any antivirus software that is installed and try creating a new site that way.
This FAQ is for Windows specifically, but you might read through it to get a general idea of how to get things working under macOS:
Either way, let us know what you find as well as the things that you’ve tried while attempting to fix this!