How do I check to see if the player has the given gamepass and give them the item?

passId = 6632153  --gravity
passId2 = 6632270 --speed
market = game:GetService("MarketplaceService")

game.Players.PlayerAdded:Connect(function(player)
	function hasGravityPass(player)
		return market:UserOwnsGamePassAsync(player,passId)
	end
	function hasSpeedPass(player)
		return market:UserOwnsGamePassAsync(player,passId2)
	end
	player.CharacterAdded:Connect(function(char)
		if hasGravityPass() == true then
			grav = game.ServerStorage.GravityCoil:Clone()
			grav.Parent = player.Backpack
		end
		if hasSpeedPass() == true then
			speed = game.ServerStorage["Acceleration Coil"]:Clone()
			speed.Parent = player.Backpack
		end
	end)
end)

It is returning with an error of "Argument 1 missing or nil"