I think i am correct but what is the wrong?
local ChoosenMap2 = game:GetService("ReplicatedStorage").Values:WaitForChild("ChoosenMap").Value
game:GetService("ServerStorage"):WaitForChild("Maps")(ChoosenMap2):Clone().Parent = game:GetService("Workspace")
20:54:42.495 - Spleef is not a valid member of Folder

2 comments
Give more details please
Line 3. ChosenMap2 is wrapped in brackets, which are math exclusive. Remove them.