Unable to upgrade vSM tv5.1 o vCNS v5.5

Trying to upgrade my vSphere deployment from v5.1 to the newly released v5.5.  vCD has been upgraded, vCenter is done, and now I'm trying to upgrade two vShield Manager v5.1.2-9977359 VMs to 5.5 and, no matter what I do, I get the following error:

Has anybody hit a similar problem, or have suggestions on how I can get past it?

Thanks,

Ryan