Lua Failed to execut event - Event still executes.

[kyoushirou]

Getting the following error every time a globalevent loads:

[Error - GlobalEvents::think] Failed to execute event: NPCTalk

Here's the script:

local ZornLines = {
'Hmm.. If I cast this spell and then..  <mumbles>', 
'Perhaps the essence.. <mumbles>', 
'I knew it! Thats how.. <mumbles>'
}

local HubertLines = {
'Fresh fruit!', 
'Fruit straight from the jungle! Right here!'
}

local LuciusLines = {
'Arrow to the god d@m# knee...',
'I used to be an adventurer like you!'
}

local NimeaLines = {
'<grmbl> I hate spiders.',
'Now where did I put that book on the ancient tombs?'
}

local ZealoLines = {
'Get your map marks here!',
'I\'ll mark your map for free!'
}

local ZannLines = {
'Help me cleanse the Crypts!',
'Help me sanctify any undead creature products. I\'ll trade you for them!'
}

function onThink(interval)
-- Zorn
local ZornLine = ZornLines[math.random(#ZornLines)]
local ZornID = Npc("Archmage Zorn")
ZornID:say(ZornLine, TALKTYPE_SAY)

-- Hubert
local HubertLine = HubertLines[math.random(#HubertLines)]
local HubertID = Npc("Hubert")
HubertID:say(HubertLine, TALKTYPE_SAY)

-- Lucius
local LuciusLine = LuciusLines[math.random(#LuciusLines)]
local LuciusID = Npc("Lucius")
LuciusID:say(LuciusLine, TALKTYPE_SAY)

local NimeaLine = NimeaLines[math.random(#NimeaLines)]
local NimeaID = Npc("Nimea")
NimeaID:say(NimeaLine, TALKTYPE_SAY)

local ZealoLine = ZealoLines[math.random(#ZealoLines)]
local ZealoID = Npc("Guide Zealo")
ZealoID:say(ZealoLine, TALKTYPE_SAY)

local ZannLine = ZannLines[math.random(#ZannLines)]
local ZannID = Npc("Zann")
ZannID:say(ZannLine, TALKTYPE_SAY)
end

Trying to find what causes the error but not finding anything.