I have this error when I want to start some of my virtual machines on ESX 3.0.2. hosts. The hosts just lost network connection because of a switch reboot.
After they had conncetion again, I just reconnected the servers in the Virtual Infrastructure Client.
Some of the VMs were still online, others were offline. The offline ones are now the ones, with the error messages.
But I don't understand the messages. The disk files are still in the old location, the nvram file is still there. wo why does this error come up ? 