OK, I added 2 appliances to my zenworks server recently, and I can't log into ZCC on them now. I get a blank page when I browse to them.
The ZCC log file from the appliance logs the following error:

[DEBUG] [03/15/2017 16:06:16.420] [1464] [ZENServer] [76] [zenworks] [ZCC] [] [javax.servlet.jsp.JspException: com.novell.zenworks.datamodel.exceptions.DataModelConfigurationException: An error occurred processing the configuration file: com/novell/zenworks/datamodel/SystemUpdateEx.cfg.xml
I can't find the file "SystemUpdateEx.cfg.xml" anywhere on the device.

And this happened on BOTH appliances. Any ideas where to start looking?