Hi @antonmarin!
Have you successfully run Trellis Vagrant VMs on your machine in the past, or are you working on getting it set up for the first time?
As best I can tell, this is just a Vagrant issue, not specific to Trellis, so I believe you’ll ultimately find the resolution by searching beyond Roots discourse. I think you’ll find many ideas to try if you google around, e.g., this or various others.
Here are a few ideas nonetheless.
Give the NFS a few more chances to mount correctly. Try these a few times:
vagrant reload --provision
or more drastic:
vagrant destroy -f && vagrant up
Also try this:
If you still have trouble, check your /etc/exports and remove any invalid entries related to Vagrant then vagrant destroy -f && vagrant up
You might also update your version of VirtualBox.
You might also just try a completely fresh download of Trellis, with no customizations (just use the default example.com). If it works, that would suggest the problem was with your customizations.