I'm was seeing the same thing but I was able to proceed by doing a refresh in the browser. I would still receive the error from time to time as I browsed through the interface. I found that the vCAC core appliances were running on the same host in my lab and the time was off by 2 minutes from the SSO appliance that ran on another host with accurate time.  I synced the time on the vCAC core appliances (sntp -R no -p time.vmware.local) and the issue went away.  Since this was just in my lab and it wasn't an urgent issue, I didn't dig through the logs so I don't know if my logs matches yours.