Strange warning and error by trying to save data

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#1

I got warning and error by trying to save table to data store.
I tried to put Color3 value into table, but nothing changed.
Warning: “104: Cannot store Dictionary in data store. Data stores can only accept valid UTF-8 characters.”
Error: “DataStoreService: CantStoreValue: Cannot store Dictionary in data store. Data stores can only accept valid UTF-8 characters. API: SetAsync, Data Store: CarColor”
Also it is sever side script.
My script:

local DataStoreService = game:GetService("DataStoreService")
local ReplicatedStorageService = game:GetService("ReplicatedStorage")
local RemoteEvents = ReplicatedStorageService:WaitForChild("RemoteEvents")
local Event = RemoteEvents:WaitForChild("UpdateCarColor")
local DataStore = DataStoreService:GetDataStore("CarColor")
function saveData(plr,UpdatedColor)

	if not plr:FindFirstChild("DATA FAILED TO LOAD") then
		
		local compiledData = {}
		compiledData.CarColor = UpdatedColor
		local success, err = nil, nil
		while not success do
			success, err = pcall(function()
				DataStore:SetAsync(plr.UserId, compiledData) --warning and error here
			end)
			if err then
				warn(err)
			end
			task.wait(0.02)
		end
	end
end
Event.OnServerEvent:Connect(saveData)

Event fires when player change color of his car by using game menu.
Also if you want also other part of the script where i get the data i can give it to you.