You have not enabled NetFlow data export on 192.168.200.1 device. For more information, see "Enabling NetFlow and NetFlow Data Export (NDE) on Cisco Catalyst Switches" in the Support - Product Documentation area of www.solarwinds.com.
I HAVE enabled netflow from that device. That's the only netflow capable device I even have! And NTA shows traffic just fine. So no other problem than this useless notification.
Previously I had a "wrong" interface put as netflow source (it worked with it, but it was the different vlan that was in NCM, so it was little bit baffling. So I corrected it, but this this same event comes.