The cert issue may not be a huge problem and is probably not going to stop you as I see these quiet often. However the below snip from your log file will stop you in your conversion.
[#1] [2013-01-16 17:07:12.586 03276 error 'App'] CreateVm task failed: The device or operation specified at index '1' is not supported for the current virtual machine version 'vmx-04'.
[#1] A minimum version of 'vmx-06' is required for this operation to succeed.
[#1] [2013-01-16 17:07:12.586 03276 error 'App'] TargetVmManagerImpl::CreateVM: Vm creation failed with fault vim.fault.DeviceUnsupportedForVmVersion
When you run converter check your hardware version you are trying to use for the destination machine and ensure that it is v6 or higher.