How do you fix "Model:GetPrimaryCFrame() failed because no PrimaryPart has been set"?

So I was trying to make a morph GUI, even tried to follow tutorials and browsed online for sources. Anyway, I kept having this specific error:

"Model:GetPrimaryCFrame() failed because no PrimaryPart has been set, or the PrimaryPart no longer exists. Please set Model.PrimaryPart before using this.

Here's the script in problem in ServerScriptService:

local event = game.ReplicatedStorage.ChangeChar

event.OnServerEvent:Connect(function(player,model)
	local Char = model:Clone()
	local Pos = player.Character:GetPrimaryPartCFrame()
	player.Character:Destroy()
	player.Character = Char
	Char.Parent = workspace
	Char:SetPrimaryPartCFrame(Pos)
end)

If you have any tips for a morph GUI though to fix this entire mess, I'd gladly listen..

easy just click on the model that you want and set primaryPart to watever you want