Esxupdate error 99 when scanning host for updates

This weekend i tried to update my esxi hosts and i got this error :

I investigated the issue to this vmware article :
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&docTypeID=DT_KB_1_1&externalId=2043170

which fixed the issue.