This is a switch in the settings. Just turn it off, and that won't come up anymore. It turns on by itself when you change another setting (that I can't remember what it is right now)
"No Teletext" appears if the default menu setting for Teletext - OFF is changed to ON.
Very few Teletext data services are available to North America. Unless you are on one of these services, turn Teletext menu setting to OFF and you will not see this display.