What is in this blueprint? Do you have a custom property which is calling something that doesn't exist? Is it XaaS? What version of vRA? Need more information here...
Sorry about the lack of info. This was an existing blueprint which is why I was confused about the error which I had never seen before. Apparently work was going on with vCenters and the PSC's which broke the vCenter plugin connection. Rebooting the vRO/vRA appliances fixed the issue.
