What steps will reproduce the problem?
1. French Version only i suppose...
2. load a character at Azuremyst/Bloodmyst Isles (French:Îles de Brume-azur/Brume-sang)
3. Get the error message :(

What is the expected output? What do you see instead?

My cartographer add-on working....and with QuestHelper

What version of the product are you using?

r2290

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

Date: 2009-01-03 18:57:15
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\Cartographer_POI\POI.lua line 143:
   Trying to set a note with an unknown zone: "Île de Brume-sang"
Debug:
   ...tographer\libs\LibRockEvent-1.0\LibRockEvent-1.0.lua:474
      ...tographer\libs\LibRockEvent-1.0\LibRockEvent-1.0.lua:415
   (tail call): ?
AddOns:
  Swatter, v3.1.9 (<%codename%>)
  Cartographer, v2.0
  CartographerBattlegrounds, v2.0
  CartographerCoordinates, v2.0
  CartographerFoglight, v2.0
  CartographerGroupColors, v2.0
  CartographerGuildPositions, v2.0
  CartographerInstanceLoot, v2.0
  CartographerInstanceMaps, v2.0
  CartographerInstanceNotes, v2.0
  CartographerLookNFeel, v2.0
  CartographerNotes, v2.0
  CartographerPOI, v2.0
  CartographerProfessions, v2.0
  CartographerQuestInfo, v
  CartographerWaypoints, v2.0
  CartographerZoneInfo, v2.0
  (ck=202)

Please provide any additional information below.
I've tried first what you said in your project page (delete/rename CArtographer.lu in my account folder, desactivate all the other add-ons), but was the same thing.

And oddly, Exodar zone works perfectly...As well the other I've already visited  (SW, IF, Darnassus, Booty Bay,...)
It seems there's a problem of translation between French and English zone names. I've checked In LibBabble, but except the "Ile" word what was mispelled (it's "Île"), it seems nothing's wrong.
By the way : Yes, I've replaced the mispelled word by the good one in the LibBabble-Zone-3.0.lua file, but it changed nothing. Help ?

Thanks by advance and keep the good work up ^^
Best wishes and Happy New Year 2009 !