Argument 1 missing or nil explanation and fix?

I am making a sandbox game, and when i press a button, it should make the item that a player is placing higher or lower. This is the Client Placing Script:

local player = script.Parent.Parent.Parent
local placementHandler = require(script:WaitForChild("PlacementModule"))
if player.team == game.Teams.Lavender then
	base = workspace.Lavender
elseif player.team == game.Teams.Mint then
	base = workspace.Mint
elseif player.team == game.Teams.Toothpaste then
	base = workspace.Toothpaste
elseif player.team == game.Teams.White then
	base = workspace.White
end
local items = game:GetService("ReplicatedStorage").Items
local plane = placementHandler.new(base.Baseplate, base.ItemHolder, 1)
local dummyModel
local signal
local currentItemName

local function cancelPlacement()
	if (currentItemName) then
		plane:disable()
		if (dummyModel.Parent) then
			dummyModel:Destroy()
		end
		dummyModel = nil
		signal = nil
		currentItemName = nil
	end
end

local function initiatePlacement(itemName)
	cancelPlacement()
	
	dummyModel = items[itemName]:clone()
	
	currentItemName = itemName
	
	for _, object in pairs(dummyModel:GetChildren()) do
		if (object:IsA("BasePart")) then
			object.CanCollide = false
		end
	end
	
	--
	
	local function onKeyPress4(inputObject, gameProcessedEvent)
		if inputObject.KeyCode == Enum.KeyCode.Up then
			dummyModel.MainPart.Position =  Vector3.new(dummyModel.MainPart.Position.X,dummyModel.MainPart.Position.Y + 1,dummyModel.MainPart.Position.Z)
		end
	end

	game:GetService("UserInputService").InputBegan:connect(onKeyPress4)
	
	local function onKeyPress5(inputObject, gameProcessedEvent)
		if inputObject.KeyCode == Enum.KeyCode.Down then
			dummyModel.MainPart.Position =  Vector3.new(dummyModel.MainPart.Position.X,dummyModel.MainPart.Position.Y - 1,dummyModel.MainPart.Position.Z)
		end
	end

	game:GetService("UserInputService").InputBegan:connect(onKeyPress5)
	
	--
	
	dummyModel.Parent = workspace
	
	local signal = plane:enable(dummyModel)
	
	signal:connect(function(location, _)
		game:GetService("ReplicatedStorage").ClientPlaced:FireServer(currentItemName, location)
	end)
end

function onKeyPress(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.P then
		initiatePlacement("Platform")
	end
end

game:GetService("UserInputService").InputBegan:connect(onKeyPress)

function onKeyPress2(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.L then
		initiatePlacement("Lava")
	end
end

game:GetService("UserInputService").InputBegan:connect(onKeyPress2)


game:GetService("UserInputService").InputBegan:connect(onKeyPress)

function onKeyPress3(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.Q then
		cancelPlacement()
	end
end

game:GetService("UserInputService").InputBegan:connect(onKeyPress3)

player.Character:WaitForChild("Humanoid").Died:connect(function()
	cancelPlacement()
end)

This is the server placement script:

local items = game:GetService("ReplicatedStorage").Items

game:GetService("ReplicatedStorage").ClientPlaced.OnServerEvent:connect(function(player, itemName, location)
	local itemTemplate = items:FindFirstChild(itemName)
	
	if (itemTemplate) then
		local item = itemTemplate:clone()
		if player.team == game.Teams.Lavender then
			item.Parent = workspace.Lavender.ItemHolder
		elseif player.team == game.Teams.Mint then
			item.Parent = workspace.Mint.ItemHolder
		elseif player.team == game.Teams.Toothpaste then
			item.Parent = workspace.Toothpaste.ItemHolder
		elseif player.team == game.Teams.White then
			item.Parent = workspace.White.ItemHolder
		end
		item:SetPrimaryPartCFrame(location.X,location.Y,location.Z)
	end
end)

This is the part of the scripts that I'm worried about:

Client:

local function initiatePlacement(itemName)
	cancelPlacement()
	
	dummyModel = items[itemName]:clone()
	
	currentItemName = itemName
	
	for _, object in pairs(dummyModel:GetChildren()) do
		if (object:IsA("BasePart")) then
			object.CanCollide = false
		end
	end
	
	--
	
	local function onKeyPress4(inputObject, gameProcessedEvent)
		if inputObject.KeyCode == Enum.KeyCode.Up then
			dummyModel.MainPart.Position =  Vector3.new(dummyModel.MainPart.Position.X,dummyModel.MainPart.Position.Y + 1,dummyModel.MainPart.Position.Z)
		end
	end

	game:GetService("UserInputService").InputBegan:connect(onKeyPress4)
	
	local function onKeyPress5(inputObject, gameProcessedEvent)
		if inputObject.KeyCode == Enum.KeyCode.Down then
			dummyModel.MainPart.Position =  Vector3.new(dummyModel.MainPart.Position.X,dummyModel.MainPart.Position.Y - 1,dummyModel.MainPart.Position.Z)
		end
	end

	game:GetService("UserInputService").InputBegan:connect(onKeyPress5)
	
	--
	
	dummyModel.Parent = workspace
	
	local signal = plane:enable(dummyModel)
	
	signal:connect(function(location, _)
		game:GetService("ReplicatedStorage").ClientPlaced:FireServer(currentItemName, location)
	end)
end

Server:

item:SetPrimaryPartCFrame(location.X,location.Y,location.Z)

When i press the button, it works to make the dummy model go up, but when I try to place the item, it gives the error message:

15:51:58.268 - Argument 1 missing or nil

15:51:58.268 - Stack Begin

15:51:58.269 - Script 'ServerScriptService.ServerPlacement', Line 17

15:51:58.269 - Stack End

Please help me, I need to know how to fix this.

item:SetPrimaryPartCFrame(CFrame.new(location.X,location.Y,location.Z))