I’m copying some virtual servers around our ESXi hosts, using ovftool, and ran into a problem with one of them throwing Error: Fault cause: vim.fault.FileNotFound.
This support thread gave me a clue to the eventual solution. Adding the --noImageFiles didn’t fix the problem for me, but going into the VM properties and disconnecting the virtual disc drive from the .iso file it was attached to did get rid of the error and let me kick-off the transfer.