This may help. It's a quote from the comments at the wowace.com page for Pitbull4.
The default for texts is LuaTexts. You will need to go under Modules to turn Dogtags on and turn LuaTexts off. If you haven't done so... that's why you are getting an error.
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Source:
http://www.wowace.com/addons/pitbull4/