query did not return a unique result: 2

I had an issue after upgrading to vCloud 5.5 that I could not deploy any vApps with nested ESXi hosts.  It turned out that the workaround I put in place in vCloud 5.1 by adding the OS type of vmkernel5guest caused a duplicate entry as vCloud 5.5 adds this in this value that did not exist before.  Hope this helps someone out!