In the past few weeks I had to move some VMs between standalone ESXi hosts, without any kind of shared storage, using OVF tool. Not going to cover the copy process using OVF, for that you can read William Lam blog post about it.
During the process of copying one of the VMs I received the following error: Error:vim.fault.FileNotFound. This error means that the VM has an ISO still connect to it. What you have to do is to go in the vSphere client and disconnect the ISO and after that the copying process will work.