1x HandyNotes_Lorewalkers\Lore.lua:250: GetAchievementCriteriaInfo(achievementID, criteriaIndex [,countHidden]), criteria not found
[string "=[C]"]: ?
[string "@HandyNotes_Lorewalkers\Lore.lua"]:250: in function (for generator)' [string "@HandyNotes\HandyNotes-v1.6.1.lua"]:433: in function UpdateMinimapPlugin'
[string "@HandyNotes\HandyNotes-v1.6.1.lua"]:492: in function ?' [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function SendMessage'
[string "@HandyNotes_Lorewalkers\Lore.lua"]:327: in function ?' [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function Fire'
[string "@datastore\libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <DataStore\libs\AceEvent-3.0\AceEvent-3.0.lua:119>

I don't see this happening. Can I get a little context about when you saw it?

Sorry im not sure as it happened sometime in the span of 10-15m of me being in isle of thunder in between ui /reloads
If i get it again I will let you know more precisely, I was hoping the error alone would be enough

Update - I just entered "blood in the snow" heroic scenario from vale and got the error
Hope this helps track it down better

8x HandyNotes_Lorewalkers\Lore.lua:250: GetAchievementCriteriaInfo(achievementID, criteriaIndex [,countHidden]), criteria not found
[string "=[C]"]: ?
[string "@HandyNotes_Lorewalkers\Lore.lua"]:250: in function (for generator)' [string "@HandyNotes\HandyNotes-v1.6.1.lua"]:433: in function UpdateMinimapPlugin'
[string "@HandyNotes\HandyNotes-v1.6.1.lua"]:492: in function ?' [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function SendMessage'
[string "@HandyNotes_Lorewalkers\Lore.lua"]:327: in function ?' [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ore\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@DataStore\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function Fire'
[string "@datastore\libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <DataStore\libs\AceEvent-3.0\AceEvent-3.0.lua:119>

I can't reproduce this still, but I can add in some defensive code around where the error is happening and see if that helps...

Could you update to the new alpha and let me know if you're still seeing the error?