LUA error you post is problem related to Addons  
	Run WoW on a clean, default Interface then do test playing for awhile.  
	Way to do this is 
 
		Open the World of Warcraft folder.
	
	
		Rename the Cache, Interface, and WTF folders to CacheOld, InterfaceOld, and WTFOld.
	
	
		Launch the game to recreate the default folder structure.