I get the same error from time to time. I have not yet traced what is doing it, but the file for the "wild ride" is in Quest Behaviors\26028-MrDsWildRide.cs folder AND in the Quest Behaviors\SpecificQuests\Kalimdor\Stonetalon Mountains\26028-MrDsWildRide.cs
NickSeven - it seems to resolve this for quite a while if you delete the file Quest Behaviors\26028-MrDsWildRide.cs Eventually another store package will replace it, just delete it again, exit honorbuddy and restart and you should be fine for a bit.
Perhaps Tony or someone can scan the packages in the store and see which ones are putting this file in a different place. I first got this error when I was using Brodieman's darkmoon profile so perhaps thats a starting point for you.