Attempt to index nil with name and parent?

The script I supposed to chose a random map and spawn it in. But I got a few errors.

"Attempt to index nil with 'Name' "

Then I changed it a little and got

Attempt to index nil with 'Parent' "

Script:

local ServerStorage = game:GetService("ServerStorage")
local MapsFolder = ServerStorage:WaitForChild("Maps")

while true do

    status.Value = "Intermission"
    wait(10)

    local Maps = MapsFolder:GetChildren()

    local randomMap = math.random(1,#Maps)

    Status.Value = "Map chosen: "..randomMap.Name

    randomMap.Parent = game.Workspace
end