While true loop works first time but not second?

So, I have a while true loop and part of it, is this:

while true do
	MScreen = game.Lighting.MurderScreen:Clone()
	MScreen.Parent = V.PlayerGui
	repeat wait() until MScreen.Parent == V.PlayerGui
	MScreen.Name = "MurderScreen"
	wait()
	repeat wait() print("Waiting") until MScreen:FindFirstChild("MurderType")  -- ERROR LINE
	wait(10)
end

whenever it goes a second time, it can never find MurderType but it always works the first time

Full script: (error at line 150)

if Re >= 2 then
		wait()
	while true do
		wait()
		local R = game.Workspace.InGame:GetChildren()
	local Re = #R
		if Re >= 2 then
	local pLayers = game.Workspace.InGame:GetChildren()
	if #pLayers ~= 0 then
	Picking.Visible = false
	Playeri.Visible = true
	Days.Visible = true
	Playeri.Text = "Players Left: " .. #pLayers
	local Time = game.Lighting.ClockTime
	Time = 12
	while true do
		if Time >= 20 then break end
		if game.Workspace.Reported.Value == true then break end
	game.Lighting:SetMinutesAfterMidnight(Time*60)
	wait(0.1)
	Time = Time + 0.05
	print(Time)
	end
	if game.Workspace.Reported.Value == true then 
		game.Lighting.ClockTime = 12
		for i,v in pairs(game.Players:GetChild()) do
			if v.Winner.Value == true then
				Winner = v.Name
			end
		end
		Days.Visible = false
		Playeri.Visible = false
		Picking.Text = Winner .. " found out who the murderer was"
		Picking.Visible = true
		wait(3)
		Picking.Text = "It was..."
		wait(3)
		Picking.Text = game.Workspace.Murderer.Value
		wait(2)
		game.Workspace.CoinGiver.Disabled = false
		repeat wait() until game.Workspace.CoinGiver.Disabled == false
		Days.Visible = false
		Playeri.Visible = false
		Picking.Text = "Everyone Now Gets Coins!!"
		Picking.Visible = true
		wait(3)
		break
	end
	if #IN >= 1 then 
		for i,v in pairs(game.Workspace.DeadBody:GetChildren())do
			v:Remove()
		end
	end
	for i,v in pairs(game.Workspace.InGame:GetChildren()) do
		local V = game.Players:FindFirstChild(v.Name)
			V.PlayerGui.Black.Frame.In.Disabled = false
			V.PlayerGui.Black.Frame.Out.Disabled = true
			wait(5)
		if v.Name == game.Workspace.Murderer.Value then
			print("Found")
			local V = game.Players:FindFirstChild(v.Name)
			MScreen = game.Lighting.MurderScreen:Clone()
			MScreen.Parent = V.PlayerGui
			repeat wait() until MScreen.Parent == V.PlayerGui
			MScreen.Name = "MurderScreen"
			local Players = game.Workspace.InGame:GetChildren()
			local Ran1 = math.random(1,#Players)
			local P1 = Players[Ran1]
			local Ran2 = math.random(1,#Players)
			local P2 = Players[Ran2]
			local Ran3 = math.random(1,#Players)
			local P3 = Players[Ran3]
			wait(10)
			if P1.Name == game.Workspace.Murderer.Value then
				while true do
					wait()
					local Ran1 = math.random(1,#Players)
					local P1 = Players[Ran1]
					if P1.Name ~= game.Workspace.Murderer.Value then MScreen.Players.Player1.Text = P1.Name 
					MScreen.Players.Player1.PlayerName.Value = P1.Name break end
				end
				else
			MScreen.Players.Player1.Text = P1.Name
			MScreen.Players.Player1.PlayerName.Value = P1.Name
			end
			if P2.Name == game.Workspace.Murderer.Value or P1.Name then
			while true do
					if #Players <= 2 then MScreen.Players.Player2.Text = "Eliminated" break end
					wait()
					local Ran2 = math.random(1,#Players)
					local P2 = Players[Ran2]
					if P2.Name ~= game.Workspace.Murderer.Value and P2.Name then MScreen.Players.Player2.Text = P2.Name 
					MScreen.Players.Player1.PlayerName.Value = P1.Name break end
					end
			else
			MScreen.Players.Player2.Text = P2.Name
			MScreen.Players.Player2.PlayerName.Value = P2.Name
			end
			if P3.Name == game.Workspace.Murderer.Value or P2.Name then
			while true do
				if #Players <= 3 then MScreen.Players.Player3.Text = "Eliminated" break end
					wait()
					local Ran3 = math.random(1,#Players)
					local P3 = Players[Ran2]
					if P3.Name ~= game.Workspace.Murderer.Value and P3.Name then MScreen.Players.Player3.Text = P3.Name 
					MScreen.Players.Player1.PlayerName.Value = P1.Name break end
				end
				else
			MScreen.Players.Player3.Text = P1.Name
			MScreen.Players.Player3.PlayerName.Value = P3.Name
			end
			local Murders = game.Lighting.KillingWays:GetChildren()
			local Ran1 = math.random(1,#Murders)
			M1 = Murders[Ran1]
			if #Murders >= 2 then
			local Ran2 = math.random(1,#Murders)
			M2 = Murders[Ran2]
			if #Murders >= 3 then
			local Ran3 = math.random(1,#Murders)
			M3 = Murders[Ran3]
			end
			end
			MScreen.MurderType.Option1.Text = M1.Value
			MScreen.MurderType.Option1.Type.Value = M1.Name
			print(M1.Value)
			if M2 ~= nil then
			if M2.Value == M1.Value then
			for i,v in pairs(game.Lighting.KillingWays:GetChildren()) do
					if v.Value ~= M1.Value then 
					M2 = v
end
				end
			end
			MScreen.MurderType.Option2.Text = M2.Value
			MScreen.MurderType.Option2.Type.Value = M2.Name
			end
			end
			if M3 ~= nil then
				print("VAUT")
			if M3.Value == M1.Value then
			for i,v in pairs(game.Lighting.KillingWays:GetChildren()) do
					if v.Value ~= M1.Value then
						if v.Value ~= M2.Value then
					M3.Value = v.Value
					print(M3.Value)
						end
					end
					end
			end
			repeat wait() print("Waiting") until MScreen:FindFirstChild("MurderType") 
                                                 --ERROR LINE ABOVE
			local MurderType = MScreen:WaitForChild("MurderType")
			MScreen:WaitForChild("MurderType").Option3.Text = M3.Value
			MScreen.MurderType.Option3.Type.Value = M3.Name
			if M3.Value == M2.Value then
			for i,v in pairs(game.Lighting.KillingWays:GetChildren()) do
					if v.Value ~= M1.Value then
						if v.Value ~= M2.Value then
					M3.Value = v.Value
						end
					end
					end
			end
			
			MurderType.Option3.Text = M3.Value
			MurderType.Option3.Type.Value = M3.Name
			end
			local MScreen = game.Players:FindFirstChild(game.Workspace.Murderer.Value).PlayerGui:WaitForChild("MurderScreen")
	end	
			MScreen.MurderType.Option1.Script.Disabled = false	
			MScreen.MurderType.Option2.Script.Disabled = false
			MScreen.MurderType.Option3.Script.Disabled = false		
			MScreen.Players.Player1.Script.Disabled = false
			MScreen.Players.Player2.Script.Disabled = false	
			MScreen.Players.Player3.Script.Disabled = false
			wait()	
			MScreen.Enabled = true
			while true do 
				wait()
				print("Waiting")
				if MScreen.Enabled == false then break end
			end
			MScreen:Remove()
			wait()
			print("Done")
			local IN = game.Workspace.DeadBody:GetChildren()
			for i,v in pairs(game.Workspace.InGame:GetChildren()) do
				local V = game.Players:FindFirstChild(v.Name)
				V.PlayerGui.Black.Frame.In.Disabled = true
				V.PlayerGui.Black.Frame.Out.Disabled = false
			end
		end 
		else
			print("Disabled")
		game.Workspace.CoinGiver.Disabled = false
		repeat wait() until game.Workspace.CoinGiver.Disabled == false
		Days.Visible = false
		Playeri.Visible = false
		Picking.Text = "Giving Players Coins"
		Picking.Visible = true
		wait(3)
		break
		end
	end
		
		end