The server fault ‘SystemError’ had no message.

You have to love error messages that you have no idea what it means.  Call “PropertyCollector.RetrieveContents” for object “propertyCollector” on vCenter Server “*” failed.  I got this error message when I tried to clone over a template to a different vCenter farm.   I have seen this issue before at my previous job, but was unable to fix it.   After doing some searching I was able to find find a few things that lead me to believe it happened when we updated vSphere.   I don’t know exactly when, because I have patched VMware multiple times.   This just seem to have an effect on the templates and changing hardware.  This is how I was able to resolve it..  Verify what datastore the server is located on. Remove the server from inventory and then add it back.   It was that simple.   I will assume that an upgrade had messed with the configuration file for the specific VM I was having issues with.   Maybe a connected CD drive that is no longer connected.   However, this is the only work around I found without having to clone the VM.