Each time I have experienced this it has not been an issue with Local. It has been a port conflict on my machine as the error message indicates. On a Mac you can look under the Memory
tab in Activity Monitor and sort the Ports column to see what is using Port 80
which in my experience has been the port causing issues. This may not give you enough details though so you may need to run terminal commands to help you get a better list. sudo lsof -i :80
provided more details for me.
A few things to try: kill Apache if it is running, quit Docker if you are using that, make sure MAMP isn’t running, check Homebrew for any services you may have started. These are just starting points I would check. I hope you are able to figure out what is causing the conflict on your machine!