VM has become 'inaccessible' - Vagrant no longer working

Question

For some reason this morning when I run \'vagrant up\' I get the following error (this has worked absolutely fine for over a year)

Your VM has b         


        

Answer 1

I had to rename [vm-id].vbox-tmp (on VirtualBox VMs) to [vm-id].vbox. After that, without delete the .vagrant folder, I could run vagrant up and it worked very well.