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# Line 31 Attempt to get length of a nil value?

So I have a problem with my module script where is says there is a nil value I have tried going on the dev forum and looking it up, and just simply looking up the error but here is the script

P.S this is for a egg system

local petModule = {}

petModule.pets = {
["Epic"] = {game.ReplicatedStorage.pets.LavaBird};
["Rare"] = {game.ReplicatedStorage.pets.StereoPet};
["Uncommon"] = {game.ReplicatedStorage.pets.DodgeBall};
["Basic"] = {game.ReplicatedStorage.pets.BasicDoggo};

}

petModule.rarityTable = {

["Epic"] = 4;
["Rare"] = 16;
["Uncommon"] = 30;
["Common"] = 50;

}

petModule.chooseRandomPet = function()

local randomNumber = math.random(1,100)

local counter = 0

for rarity, weight in pairs(petModule.rarityTable) do
counter = counter + weight
if randomNumber <= counter then

local rarityTable = petModule.pets[rarity]
local chosenPet = rarityTable[math.random(1, #rarityTable)]

return chosenPet
end
end
end

return petModule


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local rarityTable = petModule.pets[rarity]
local chosenPet = rarityTable[math.random(1, #rarityTable)]


I think the problem is that there is nothing called "Rarity" In Petmodule.pets, I might be wrong.