From 4.3 log:
[#2] [2013-06-19 20:08:15.517 05932 error 'App'] CreateVm task failed: The device or operation specified at index '1' is not supported for the current virtual machine version 'vmx-04'.
[#2] A minimum version of 'vmx-06' is required for this operation to succeed.
self explaining error...
HTH