Problem with teleporting players?

I can see 2 problems with your script. First, you are trying to reference objects named '1', '2', '3', etc. I doubt that you named your spawns that way, based on your error.

You should use the pairs function correctly, like this:

for i, spawns in pairs(MapClone:FindFirstChild("Spawns"):GetChildren()) do
    player.Character:MoveTo(spawns.Position)
end

Second, you are teleporting every player to every spawn, making all of them finally teleport to the last spawn. To fix this, you should make a table variable that holds the spawns' children and then reference that table.

Here is how to do that:

local spawns = MapClone:FindFirstChild("Spawns"):GetChildren()

for i, player in pairs(game.Players:GetPlayers()) do
    player.Character.Humanoid.WalkSpeed = 0
    player.Character:MoveTo(spawns[i].Position)
end

You just have to make sure that number of spawns is greater than or equal to maximal player count or this code will error.

Hope this helped.