Failed to login to virtual machine 'guest VM name' because the VMware Tools are not running in the guest machine. Verify that the VMware tools are running and that no other program has access or is making any changes to this VM.
Failed to login to virtual machine because the VMware Tools are not running in the guest machine.
Processing stops
Make sure that the VMware tools are running and that no other program has access or is making changes to this VM. And then retry the 'backup vm' operation.