How do I save a vector3 value from players position?

I have a DataStore script which where every one second it updates the vector3value to the players torso position. In this case it does change the value of the vector3 but on the last line I have an error saying: "Cannot store array in DataStore" once I stop the game.

script located in workspace:

local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerPos")

game.Players.PlayerAdded:connect(function(player)
	local key = "key-"..player.userId
	
	while wait(1) do
	script:WaitForChild("PlayerPosition").Value = player.Character:WaitForChild("Torso").Position
	print(script:WaitForChild("PlayerPosition").Value)
	
	end
	
	local save = DataStore:GetAsync(key)
	if save then
		script:WaitForChild("PlayerPosition").Value = save[1]

	else
		local load = {script:WaitForChild("PlayerPosition").Value}
		DataStore:SetAsync(key,load)
	end
	
	
end)

game.Players.PlayerRemoving:connect(function(player)
	local key = "key-"..player.userId
	local load = {script:WaitForChild("PlayerPosition").Value}
	DataStore:SetAsync(key,load)
end)

and since I can save the value, I have a line of code were the player teleport's back to its last position. player.Character:WaitForChild("Torso").Position = CFrame.new(Vector3.new(script:WaitForChild("PlayerPosition"))) but it doesn't work, or maybe but don't know where or how to put it. Is there a solution to this? Thank you! p.s: "PlayerPosition" is the Vector3Value inside the script