I just had this same problem on a Windows machine. For me everything was working fine until I created a new site. After that the new site would not load. I was using .bob and I tried changing that but it didn't work. I then unchecked the Auto virtual hosts in preferences and Laragon gave me an error.
It stated the problem was that the hosts file in Windows was marked as read only. This is where the new host domains are stored, therefore it could not add the new domain to the list.
The solution is to use file explorer to go C:\Windows\System32\drivers\hosts. Right click. Unclick the Read Only box. Apply and exit. After that I uncheck and rechecked the Auto Virtual Hosts back in Laragon Preferences. No error this time and all sites are working again.