com.vmware.vc.HA.ClusterContainsIncompatibleHosts
Summary
HA cluster contains ESX/ESXi 3.5 hosts and more recent host versions, which is not fully supported.
Causes
There is an issue with vSphere High Availability configuration for this cluster. Review the event description for detail on the cause.
Resolutions
See VMware online documents such as Troubleshooting VMware High Availability and the vSphere Troubleshooting Guide to resolve HA issues.
External
Refer to the online vSphere Availability Guide for further guidance.