My plugin isn't creating any models or parts even though I think I did everything correctly?

I am currently working on a plugin BUT the script wont do anything except make toolbar buttons

local mouse = plugin:GetMouse()
local ChangeHistoryService = game:GetService("ChangeHistoryService")

local toolbar = plugin:CreateToolbar("Better Building Tools")
local putInFolder = toolbar:CreateButton("Put selected objects in a folder", "Put selected objects in a folder", "rbxassetid://4459262762")
local betterSpawnLocation = toolbar:CreateButton("Better Looking Spawn", "Create a new spawn", "rbxasset://textures/SpawnLocation.png")
local newConveyor = toolbar:CreateButton("Conveyor", "Create a conveyor", "rbxassetid://6309194705")
local killBrick = toolbar:CreateButton("Kill Brick", "Create a Kill Brick", "rbxassetid://6309194705")

putInFolder.Click:Connect(createFolder())
betterSpawnLocation.Click:Connect(createSpawn())
newConveyor.Click:Connect(createConveyor())
killBrick.Click:Connect(createKillBrick())

function createFolder()
	local newKill = script.KillBrick:Clone()
	newKill.Parent = game.Workspace
	ChangeHistoryService:SetWaypoint("new kill brick")
end

function createKillBrick()
	local mouse = plugin:GetMouse()
	local ChangeHistoryService = game:GetService("ChangeHistoryService")
	local newKill = script.KillBrick:Clone()
	newKill.Parent = game.Workspace
	ChangeHistoryService:SetWaypoint("new kill brick")
end

function createConveyor()
	return function()
		--Converted with ttyyuu12345's model to script plugin v4
		local function sandbox(var,func)
			local env = getfenv(func)
			local newenv = setmetatable({},{
				__index = function(self,k)
					if k=="script" then
						return var
					else
						return env[k]
					end
				end,
			})
			setfenv(func,newenv)
			return func
		end
		cors = {}
		mas = Instance.new("Model",game:GetService("Lighting"))
		model = Instance.new("Model")
		model.Name = "Conveyor"
		model.Parent = mas
		Part0 = Instance.new("Part")
		Script1 = Instance.new("Script")
		UnionOperation2 = Instance.new("UnionOperation")
		Part0.Name = "Conveyor"
		Part0.Parent = model
		Part0.CFrame = CFrame.new(22, 0.5, -81, 1, 0, 0, 0, 1, 0, 0, 0, 1)
		Part0.Position = Vector3.new(22, 0.5, -81)
		Part0.Color = Color3.new(0.0666667, 0.0666667, 0.0666667)
		Part0.Size = Vector3.new(4, 1, 6)
		Part0.Anchored = true
		Part0.BottomSurface = Enum.SurfaceType.Smooth
		Part0.BrickColor = BrickColor.new("Really black")
		Part0.FrontSurface = Enum.SurfaceType.Weld
		Part0.TopSurface = Enum.SurfaceType.Smooth
		Part0.brickColor = BrickColor.new("Really black")
		Script1.Name = "ConveyorScript"
		Script1.Parent = Part0
		table.insert(cors,sandbox(Script1,function()
			local speed = 10
			while wait() do
				script.Parent.Velocity = script.Parent.CFrame.LookVector * speed
			end
		end))
		UnionOperation2.Archivable = false
		UnionOperation2.Parent = model
		UnionOperation2.archivable = false
		UnionOperation2.CFrame = CFrame.new(22.0826416, 1.125, -81.2719879, 0.707106769, 0, 0.707106769, 0, 1, 0, -0.707106769, 0, 0.707106769)
		UnionOperation2.Orientation = Vector3.new(0, 45, 0)
		UnionOperation2.Position = Vector3.new(22.0826416, 1.125, -81.2719879)
		UnionOperation2.Rotation = Vector3.new(0, 45, 0)
		UnionOperation2.Color = Color3.new(0.639216, 0.635294, 0.647059)
		UnionOperation2.Size = Vector3.new(3.04182434, 0.250000119, 3.04181671)
		UnionOperation2.BrickColor = BrickColor.new("Medium stone grey")
		UnionOperation2.brickColor = BrickColor.new("Medium stone grey")
		for i,v in pairs(mas:GetChildren()) do
			v.Parent = workspace
			pcall(function() v:MakeJoints() end)

		end
		ChangeHistoryService:SetWaypoint("Created Conveyor")
		mas:Destroy()
		for i,v in pairs(cors) do
			spawn(function()
				pcall(v)
			end)
		end

	end
end

function createSpawn()
	--Converted with ttyyuu12345's model to script plugin v4
	local function sandbox(var,func)
		local env = getfenv(func)
		local newenv = setmetatable({},{
			__index = function(self,k)
				if k=="script" then
					return var
				else
					return env[k]
				end
			end,
		})
		setfenv(func,newenv)
		return func
	end
	cors = {}
	mas = Instance.new("Model",game:GetService("Lighting"))
	Model0 = Instance.new("Model")
	WedgePart1 = Instance.new("WedgePart")
	SpawnLocation2 = Instance.new("SpawnLocation")
	Decal3 = Instance.new("Decal")
	WedgePart4 = Instance.new("WedgePart")
	WedgePart5 = Instance.new("WedgePart")
	WedgePart6 = Instance.new("WedgePart")
	Model0.Name = "SpawnPoint"
	Model0.Parent = mas
	WedgePart1.Parent = Model0
	WedgePart1.CFrame = CFrame.new(38.5, 0.5, -91.25, 0, 0, -1, 0, 1, 0, 1, 0, 0)
	WedgePart1.Orientation = Vector3.new(0, -90, 0)
	WedgePart1.Position = Vector3.new(38.5, 0.5, -91.25)
	WedgePart1.Rotation = Vector3.new(0, -90, 0)
	WedgePart1.Size = Vector3.new(4, 1, 1)
	WedgePart1.Anchored = true
	WedgePart1.BottomSurface = Enum.SurfaceType.Smooth
	WedgePart1.CanCollide = false
	SpawnLocation2.Parent = Model0
	SpawnLocation2.CFrame = CFrame.new(36, 0.5, -91.25, 1, 0, 0, 0, 1, 0, 0, 0, 1)
	SpawnLocation2.Position = Vector3.new(36, 0.5, -91.25)
	SpawnLocation2.Size = Vector3.new(4, 1, 4)
	SpawnLocation2.Anchored = true
	SpawnLocation2.BottomSurface = Enum.SurfaceType.Smooth
	SpawnLocation2.CanCollide = false
	SpawnLocation2.TopSurface = Enum.SurfaceType.Smooth
	Decal3.Parent = SpawnLocation2
	Decal3.Texture = "rbxasset://textures/SpawnLocation.png"
	Decal3.Face = Enum.NormalId.Top
	WedgePart4.Parent = Model0
	WedgePart4.CFrame = CFrame.new(36, 0.5, -88.75, -1, 0, 0, 0, 1, 0, 0, 0, -1)
	WedgePart4.Orientation = Vector3.new(0, 180, 0)
	WedgePart4.Position = Vector3.new(36, 0.5, -88.75)
	WedgePart4.Rotation = Vector3.new(-180, 0, -180)
	WedgePart4.Size = Vector3.new(4, 1, 1)
	WedgePart4.Anchored = true
	WedgePart4.BottomSurface = Enum.SurfaceType.Smooth
	WedgePart4.CanCollide = false
	WedgePart5.Parent = Model0
	WedgePart5.CFrame = CFrame.new(33.5, 0.5, -91.25, 0, 0, 1, 0, 1, -0, -1, 0, 0)
	WedgePart5.Orientation = Vector3.new(0, 90, 0)
	WedgePart5.Position = Vector3.new(33.5, 0.5, -91.25)
	WedgePart5.Rotation = Vector3.new(0, 90, 0)
	WedgePart5.Size = Vector3.new(4, 1, 1)
	WedgePart5.Anchored = true
	WedgePart5.BottomSurface = Enum.SurfaceType.Smooth
	WedgePart5.CanCollide = false
	WedgePart6.Parent = Model0
	WedgePart6.CFrame = CFrame.new(36, 0.5, -93.75, 1, 0, 0, 0, 1, 0, 0, 0, 1)
	WedgePart6.Position = Vector3.new(36, 0.5, -93.75)
	WedgePart6.Size = Vector3.new(4, 1, 1)
	WedgePart6.Anchored = true
	WedgePart6.BottomSurface = Enum.SurfaceType.Smooth
	WedgePart6.CanCollide = false
	for i,v in pairs(mas:GetChildren()) do
		v.Parent = workspace
		pcall(function() v:MakeJoints() end)
	end
	ChangeHistoryService:SetWaypoint("New SpawnPoint")
	mas:Destroy()
	for i,v in pairs(cors) do
		spawn(function()
			pcall(v)
		end)
	end
	return nil
end