V2V failed at the last step

[quest221]

I installed 5nine V2V converter on a Windows 7 computer, everything went fine in the wizard. I can see the process to download vmdk file like the following screenshot. However, after some minutes, it failed with error:
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Convert Virtual Machine Wizard
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Failed to convert virtual machine '2K3'. Failed to convert virtual hard disks: Access is denied. (Exception from HRESULT:

0x80070005 (E_ACCESSDENIED))

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OK
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11.jpg
v2v error.png

The destination computer is a Windows Server 2012 Hyper-V computer. The source is ESXi 5.0.

The Windows 7 computer is in a workgroup and the Hyper-V computer is in a domain. Is this the reason? I also would like to know whether the computers should be domain joined.