This error message will occur when you don't have your uplinks channeled correctly.
If you're using multiple uplinks to the physical switch with the 1000v, then you need to ensure you Port channel all links connecting to the same upstream switch. Even with vPC-HM, you still need to port channel multple uplinks connecting to the same switch. This needs to happen with each VEM host.
Paste your System Uplink port profile and give an idea of the topology and we'll see if we can find the issue.
Robert