Data Storage and Dictionaries Problem?

I get this error when I test my place on a local server. How can i fix my script?

Error:

21:17:17.456 - 104: Cannot store Dictionary in DataStore

Part of the Script:

game.Players.PlayerRemoving:connect(function(player)
	local key = player.userId
	local valuesToSave = {}
	local children = game.workspace[player.Name .. "Arena"]:GetChildren()
	for i = 1, #children do
		if (children[i].Name) == (player.Name .. "Part") then
			valuesToSave.Type = valuesToSave.Type or {}
    		valuesToSave.Type[tostring(i)] = children[i].blocker.Value 
			valuesToSave.transparency = valuesToSave.transparency or {}
			valuesToSave.transparency[tostring(i)] = children[i].Transparency
			valuesToSave.material = valuesToSave.material or {}
			valuesToSave.material[tostring(i)] = children[i].Material
			--Block Size
			valuesToSave.xSize = valuesToSave.xSize or {}
			valuesToSave.xSize[tostring(i)] = children[i].Size.X
			valuesToSave.ySize = valuesToSave.ySize or {}
			valuesToSave.ySize[tostring(i)] = children[i].Size.Y
			valuesToSave.zSize = valuesToSave.zSize or {}
			valuesToSave.zSize[tostring(i)] = children[i].Size.Z
			--Block Position
			valuesToSave.xPos = valuesToSave.xPos or {}
			valuesToSave.xPos[tostring(i)] = children[i].position.X - game.workspace[player.Name .. "Arena"].Spawn.Position.x
			valuesToSave.yPos = valuesToSave.yPos or {}
			valuesToSave.yPos[tostring(i)] = children[i].position.Y - game.workspace[player.Name .. "Arena"].Spawn.Position.y
			valuesToSave.zPos = valuesToSave.zPos or {}
			valuesToSave.zPos[tostring(i)] = children[i].position.Z - game.workspace[player.Name .. "Arena"].Spawn.Position.z
			--Block Color
			valuesToSave.rColor = valuesToSave.rColor or {}
			valuesToSave.rColor[tostring(i)] = children[i].Color.r
			valuesToSave.bColor = valuesToSave.bColor or {}
			valuesToSave.bColor[tostring(i)] = children[i].Color.b
			valuesToSave.gColor = valuesToSave.gColor or {}
			valuesToSave.gColor[tostring(i)] = children[i].Color.g
		
		end
	end
	
	DataStore:SetAsync(key, valuesToSave)
end)

Thanks.