I keep getting "Unable to cast to Dictionary" Error in my Egg Hatching script, what should I do?

Here is code, error is at line 54, I followed tutorial and script is exact and I don't see problem with it either.

local  TweenService = game:GetService("TweenService")

local camera = game.Workspace.Camera
local studio = game.Workspace.Studio
game.ReplicatedStorage.HatchEgg.OnClientEvent:Connect(function(pet)
	camera.CameraType = Enum.CameraType.Scriptable
	camera.CFrame = studio.CamPart.CFrame
	
	wait(0.5)
	
	for i = 1, 50, 1 do
		studio.Egg.Size = studio.Egg.Size + Vector3.new(0.1,0.1,0.1)
		wait(0,01)
	end
	
	
	
	local explosion = Instance.new("Explosion")
	explosion.BlastRadius = 10
	explosion.BlastPressure = 0
	explosion.Position = studio.Egg.Position
	explosion.ExplosionType = Enum.ExplosionType.NoCraters
	explosion.DestroyJointRadiusPercent = 0
	explosion.Parent = studio.Egg
	studio.Egg.Transparency = 1
	
	local petClone = pet:Clone()
	
	for i, v in pairs(petClone:GetChildren()) do
		if v:IsA("BasePart") then
			v.Anchored = true
		end
	end
	
	for i, v in pairs(studio.Confetti:GetChildren()) do
		if v:IsA("ParticleEmitter") then
			v.Enabled = true
		end
	end
	
	petClone:SetPrimaryPartCFrame(CFrame.new(studio.Egg.Position,studio.CamPart.Position))
	
	petClone.Parent = studio
	
	local tweenInfo = TweenInfo.new(
		2,
		Enum.EasingStyle.Bounce,
		Enum.EasingDirection.Out,
		0,
		false,
		0
		
	)
	local tween = TweenService:Create(camera, tweenInfo, {CFrame = CFrame.new(petClone.PrimaryPart.Position + (petClone.PrimaryPart.CFrame.lookVector * 5) + Vector3.new(0,0.75,0)), petClone.PrimaryPart.Position})
	tween:Play()
	
	wait(5)
	for i, v in pairs(studio.Confetti:GetChildren()) do
		if v:IsA("ParticleEmitter") then
			v.Enabled = false
		end
	end
	
	camera.CameraType = Enum.CameraType.Custom
	studio.Egg.Transparency = 0
	studio.Egg.Size = Vector3.new(8.426, 11.613, 5.717)
	petClone:Destroy()
end)

so what should I do.