The worker logs are more informative. But have got this error:
2013-05-28T10:28:10.560-05:00 [02496 warning 'Default'] [diagnosticManager,487] CRC mismatch in worker source related logs. Worker logs will not be added to server log bundle.
Can you please get it manually and upload it? It can be found in %ALLUSERSPROFILE%\VMware\VMware vCenter Converter Standalone\logs. Look for vmware-converter-worker-xxx.log.