What steps will reproduce the problem?
1. Downloading/Installing QuestHelper as well as QuestGuru
2. Selecting QuestHelper AND QuestGuru in the Addons Menu.
3. Start World of Warcraft

What is the expected output? What do you see instead?
It is expected that the two addon work together without any issues. However once loading the two addons together a LUA error occurs.

What version of the product are you using?
1.1.21

Do you have an error log of what happened?
Yes:

msg: Assertion Failed
toc: 1.1.21
v: 1.1.21
game: 3.2.2
locale: enUS
timestamp: 2009-10-08 17:36:27
mutation: nil
silent: false

Interface\AddOns\QuestHelper\utility.lua:347 in function `Assert'
Interface\AddOns\QuestHelper\director_quest.lua:427 in function <Interface\AddOns\QuestHelper\director_quest.lua:426
Interface\AddOns\QuestHelper\director_quest.lua:684 in function `func'
Interface\AddOns\QuestHelper\manager_event.lua:43 in function <Interface\AddOns\QuestHelper\manager_event.lua:25
Interface\AddOns\QuestHelper\manager_event.lua:58 in function <Interface\AddOns\QuestHelper\manager_event.lua:52

addons:
  QuestGuru, v1.2
  QuestHelper, v1.1.21

Please provide any additional information below.

I normally use a lot of addons and it took me awhile but I narrowed the issue to QuestGuru. I use QuestGuru primarily for its quest tracker and quest history. It should be noted that although I receive a LUA error, I have noticed any further issues between either of the two addons, other than perhaps a bit more lag (CPU).