Can someone help me with the error, "Attempt to index nil with CFrame?"

Hello, I am very new to scripting. I've been watching AlvinBlox's YoutTube series on how to make a game as a starting point in my Lua Learning. The problem lies within trying to teleport players to a specific part on a cloned map. I'll include the teleport portion of the main script, and the video that I'm currently learning from. I've been comparing my script with AlvinBlox's, but I cannot find the solution.

The map is successfully cloned when I test it, but the problem lies within, character:FindFirstChild("HumanoidRootPart").CFrame = AvailableSpawnPoints[1].CFrame which leads to the teleport script not being able to function, the error being "attempt to index nil with CFrame"

Thanks in advance.

local SpawnPoint = ClonedMap:FindFirstChild("SpawnPoint")
	
	if not SpawnPoint then
		print("Spawnpoints not found")
	end
	
	local AvailableSpawnPoints = SpawnPoint:GetChildren()
	
	for i, player in pairs(plrs) do
		if player then
			character = player.Character
			
			if character then
				-- Teleport
				
				character:FindFirstChild("HumanoidRootPart").CFrame = AvailableSpawnPoints[1].CFrame
				table.remove(AvailableSpawnPoints,1)
				
				--Give sword
				
				local Sword = ServerStorage.Sword:Clone()
				Sword.Parent = player.Backpack
				
				local GameTag = Instance.new("BoolValue")
				GameTag.Name = "GameTag"
				GameTag.Parent = player.Character
				
			else
				-- There is no character
				if not player then
					table.remove(plrs,i)
				end
			end
		end
	end

Try to make:

character = player.Character or player.CharacterAdded:Wait()
wait()

Or problem can be in HumanoidRootPart:

HMP = character:WaitForChild("HumanoidRootPart")
wait()
HMP.CFrame = AvailableSpawnPoints[1].CFrame