I was testing my game out and i found this error in the output. It broke a script of mine. What's wrong?

Script 1:

local timeToChange = script.Parent.timeToChange
local timeToChangeNoob = script.Parent.timeToChangeNoob
local timeToChangeGuest = script.Parent.timeToChangeGuest
local Deactivated = script.Parent.Deactivated
local RepStore = game:GetService("ReplicatedStorage")

function ManageGUIs()
	for _, p in pairs (game.Players:GetChildren()) do
		if p.Character ~= nil and p.Character.Humanoid ~= nil and p.Character.Humanoid.Health>0 and p.Character:findFirstChild("Torso") then
			local torso = p.Character.Torso
			if (torso.Position - script.Parent.Position).magnitude < 20 then
				--Open Gui
				RepStore.OpenCloseGUI:InvokeClient(p,script.Parent,true)
				--Set GUI Spawn Team Color
				RepStore.ModificateGUI:InvokeClient(p,"SpawnTeamColor",script.Parent.BrickColor.Color)
				if not Deactivated.Value then
					RepStore.ModificateGUI:InvokeClient(p,"Time",10-timeToChange.Value)
					RepStore.ModificateGUI:InvokeClient(p,"ProgressBarColor",script.Parent.BrickColor.Color)
				else
					if timeToChangeNoob.Value>timeToChangeGuest.Value then
						RepStore.ModificateGUI:InvokeClient(p,"ProgressBarColor",Color3.new(1,1,0))
						RepStore.ModificateGUI:InvokeClient(p,"Time",timeToChangeNoob.Value)
					else
						RepStore.ModificateGUI:InvokeClient(p,"ProgressBarColor",Color3.new(0,0,0))
						RepStore.ModificateGUI:InvokeClient(p,"Time",timeToChangeGuest.Value)
					end
					
				end
			elseif RepStore.ModificateGUI:InvokeClient(p,"CheckSpawn") == script.Parent then -- >>ERROR<<
				RepStore.OpenCloseGUI:InvokeClient(p,nil,false)
			end
		else
			RepStore.OpenCloseGUI:InvokeClient(p,nil,false)
		end
	end
end

while wait(0) do
	ManageGUIs()
end

Script 2 (The one that receives the InvokeClient(p,"CheckSpawn"))

wait(1)
local RepStore = game:GetService("ReplicatedStorage")
local spawnTeamColor = script.Parent.Frame.SpawnLocationImage.TeamColor
local Time = script.Parent.Frame.UnderProgressBar.ProgressBar.LocalScript.Time
local ProgressBar = script.Parent.Frame.UnderProgressBar.ProgressBar
local Spawn = script.SpawnPoint

function OpenGUI(spawn,canOpen)
	if canOpen and Spawn.Value ~= nil then
		script.Parent.Frame:TweenPosition(UDim2.new(1,-220,1,-70),"Out","Bounce",0.5,true)
	else
		script.Parent.Frame:TweenPosition(UDim2.new(1,80,1,-70),"Out","Bounce",0.5,true)
	end
end

function ModificateGUI(WTM, value1)
	if WTM == "SpawnTeamColor" then
		if value1 == BrickColor.new("New Yeller").Color then
			spawnTeamColor.BackgroundColor3 = value1
			spawnTeamColor.BorderColor3 = Color3.new(1,0.67,0)
			script.Parent.Frame.BackgroundColor3 = Color3.new(1,0.67,0)
		elseif value1 == BrickColor.new("Mid gray").Color then
			spawnTeamColor.BackgroundColor3 = value1
			spawnTeamColor.BorderColor3 = Color3.new(0.5,0.5,0.5)
			script.Parent.Frame.BackgroundColor3 = Color3.new(0.5,0.5,0.5)
		elseif value1 == BrickColor.new("Really black").Color then
			spawnTeamColor.BackgroundColor3 = value1
			spawnTeamColor.BorderColor3 = Color3.new(0.25,0.25,0.25)
			script.Parent.Frame.BackgroundColor3 = Color3.new(0.25,0.25,0.25)
		end
	elseif WTM == "Time" then
		Time.Value = value1
	elseif WTM == "ProgressBarColor" then
		ProgressBar.BackgroundColor3 = value1
	elseif WTM == "CheckSpawn" then
		return Spawn.Value
	end
end

RepStore.OpenCloseGUI.OnClientInvoke = function(spawn,canOpen)
	Spawn.Value = spawn
	OpenGUI(spawn,canOpen)
end

RepStore.ModificateGUI.OnClientInvoke = function(whatToModificate,value1)
	local fun = ModificateGUI(whatToModificate,value1)
	if fun ~= nil then
		return fun
	end
end
Anonymous