ovftool coredumped

I use ovftool to deploy an appliance to a host (esx 3.5i). after disk copy done, I got an error message and the tool core dumped.

What does the message means ?

Thanks in advance.

Opening OVF source: /home/luger_lee/tmpout/VMware-VIPerl-Toolkit-1.6.0-104313-Appliance/VMware-RCLI-3.5-U2-Appliance.ovf

Warning: No manifest file

Opening VI target: vi://root@alaska/

Target: vi://alaska/

Disk progress: 1%

...

Disk progress: 99%

Disk Transfer Failed           

Error: Unable to get NFC ticket for target disk

Error: Failed to clean up after failure. Reason: vim.fault.NotAuthenticated

terminate called after throwing an instance of 'Vim::Fault::NotAuthenticated::Exception'

  what():  vim.fault.NotAuthenticated

Terminate process signal received - aborting operation/usr/bin/ovftool: line 23: 32361 Aborted                 (core dumped) $OVFTOOL_BIN "$@"