tvapp-00148 code. Streaming comcast beta. On demand not working

Hi,
I am using the beta app kn my samsung tv to watch comcast. We are unable to streamnkn demand content.
Here are the things I've done so far:
-log off and on
-uninstall app, reinstall
-unplug & reatart tv
-unplug and restart modem

Streaming does not work even when the tv is plugged in via ethernet cable or through wifi.

Please please pease help. My daughter misses watching her favorite cartoons.