Teleport script doesn't work in server ?

The server doesn't have access to the PlayerGui, but luckily the client has access to the Character. You need to do this from the client:

LocalScript in StarterPack or PlayerGui

local plr = game.Players.LocalPlayer --You
local SomeBrick --The brick to touch
local mapIns = "map" .. SomeBrick.Parent.mapID.Value
local spawnL = workspace[mapIns].spawn
local hitRequired = SomeBrick.Parent.hitReq.Value
local notice = plr:WaitForChild("PlayerGui"):WaitForChild("notice"):WaitForChild("text")
local playerstats = plr:WaitForChild("leaderstats")

SomeBrick.Touched:Connect(function(hit)
	--Get player that touched
	local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	 --If it's you, and you have prerequisites
	if player == plr and playerstats.Hits.Value >= hitRequired then
		--Teleport
		local root = hit.Parent.HumanoidRootPart
		root.CFrame = CFrame.new(spawn.Position)
	else --Otherwise
		--Notify them
		notice.Text = "You need " .. hitRequired .. " hits or more to enter this!"
		notice.Visible = true
		wait(3.5)
		notice.Visible = false
	end
end)

######You should look into adding a Debounce