The Splunk App for Active Directory is not a straight forward "install it on the search head and you are good" app - the Technology Addons, SA-ldapsearch, macros, lookups and event types all coordinate to provide the information.
There are a bunch of things that can be going wrong here, and they are probably all driven by the fact that there is an upgrade process.
Bring up the Search page in the Splunk App for Active Directory and execute the following search:
eventtype=msad-dc-health
Make sure that is bringing back data. If it is, then the rest of the app should work, since you are getting the right things happening. If it isn't, then you are likely going to get the same error as before. Make sure the eventtypes.conf is properly installed and that there is not local copies of the eventtypes.conf.
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