index nil value

i've got the error chunk_2:(29,17-159): attempt to index a nil value i don't know what i did wrong. Can someone help. -- A basic monster script skeleton you can copy and modify for your own creations. comments = {"Smells like the work\rof an enemy stand.", "Poseur is posing like his\rlife depends on it.", "Poseur's limbs shouldn't be\rmoving in this way."} commands = {"Quack", "Laugh", "Insult"} randomdialogue = {"Random\nDialogue\n1.", "Random\nDialogue\n2.", "Random\nDialogue\n3."}

sprite = "angrydon" --Always PNG. Extension is added automatically.
name = "Donald Duck"
hp = 100
atk = 1
def = 1
check = "Quack... Wait, he can talk."
dialogbubble = "right" -- See documentation for what bubbles you have available.
canspare = false
cancheck = true

-- Happens after the slash animation but before 
function HandleAttack(attackstatus)
    if attackstatus == -1 then
        -- player pressed fight but didn't press Z afterwards
    else
        enemies[1].Call('SetSprite', "hitdon")
    end
end
 
-- This handles the commands; all-caps versions of the commands list you have above.
function HandleCustomCommand(command)
    if command == "QUACK" then
    BattleDialog{("You said quack.")}
	enemies[1].Call('currentdialogue', {"Wait...[func:SetSprite,surpdon]", "You're a duck too?", "Well...[func:SetSprite,sparedon]", "I guess i will\nspareyou"})
    enemies[1].SetVar('def', -666666)
    nextwaves = {}
    enemies[1].SetVar('canspare', true)
    elseif command == "LAUGH" then
    BattleDialog{("You laughed.")}
	enemies[1].Call('currentdialogue', {"Wait...[func:SetSprite,surpdon]", "You think i am funny?", "Well...[func:SetSprite,sparedon]", "I kinda am", "I guess i will\nspareyou"})
    enemies[1].SetVar('def', -666666)
    nextwaves = {}
enemies[1].SetVar('canspare', true)
    elseif command == "INSULT" then
    BattleDialog{("You said ducks\nare stupid")}
	enemies[1].Call('currentdialogue', {"Ducks have feelings too!"})
    end
end

P.S. if it is a really obvious mistake, then the reason is that i'm new with coding