It doesnt seem like that is enough config to export flows from an ASA. Here is a KB article showing some of the additional config you will need.
I realize the KB is written for an older version of the ASA IOS, but the commands should generally be the same.
I did not write the whole netflow export config. There is nothing wrong with the configuration. Asa is sending flow exports to the NTA server (I captured packets with Wireshark installed on the Solarwinds NTA server).
I think Cisco has changed the NetFlow template on version 8.4(5) and Solarwinds NTA is not compatible with the new template.