Topic Quest Helper not working
This is the error i get, i dont understand it
msg: Interface\AddOns\QuestHelper\pathfinding.lua:20: attempt to call global 'QueryQuestsCompleted' (a nil value)
timestamp: 2012-09-25 10:39:05
[C]: in function `QueryQuestsCompleted'
Interface\AddOns\QuestHelper\pathfinding.lua:20: in main chunk
I would assume QuestHelper is not being maintained as the fix needed to get that aspect (QueryQuestsCompleted) to work is very easy. You should ask on the QuestHelper development page.
Depending on what you want from a questing addon, I would suggest using Wholly and Grail together to know what quests you have done, what you can do based on prerequisites, and where the quest givers are. If you want something that guides you to what you "should" do next you might want to look at the WoWPro addon.