Correction: With Wowza nDVR, you can configure media cache on your edge servers with a live stream StreamType. You'll want to install media cache on your edge server and so your StreamType will be liverepeater-edge. I was able to reproduce your problem that generated the message
This is caused by an error in the media cache configuration. If you post your [install-dir]/conf/MediaCache.xml file and the exact URL you used and in which player, we can analyze further. Or, you can send a zip of [isntall-dir]/conf and logs directories to firstname.lastname@example.org.
WARN server comment MediaCache.createNewCachItem: Cannot find MediaCacheSource for (dvrorigin/[wowza-ip-address]:1935/dvrorigin/[stream-name].0/ChunkTypes(9)/ChunkIndexes(65).dvr).