"For example, if you've had one of those VCs registered already, and data was collected, you *might* also get such error.
Additional info on what you did might help"
yes, this could have happened, I'm deploying the vcops again, i unregistered all vcenters, deleted the vapp. let´s see if this would help.
tomorrow i will try register the vcenters again. my link to the other vcenter is down 
so i can´t test right now.
thanks for all the answers! tomorrow i update you guys!
Leandro Bertolino