Hi there,
Thank you very much for your reply. You are right. I didn't give this information as I post it in hurry. I use ESXi 5.0.0 and the vCenter Converter Standalone Client is also 5.0.0.
Please let me know if you need anything further. I will also have a look on the provided thread and see if it has any solution.
Kind regards,
Angelos Pitsos