VirtualBox error “Failed to open a session for the virtual machine”

I had the same issue, I tried editing the VM but it wasn’t letting me save it. So I tried the following:

  1. Tried editing the VM to change RAM/CPU etc, but it wasn’t letting me save it
  2. Deleted the vm (not the data) and tried adding it again, didn’t fix it
  3. Tried moving the vbox file to another directory and import it, but it didn’t let me move the vbox file so I realized there’s a virtualbox process running that’s holding a lock on it. So I killed that process and started it again and my VM booted

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