I dont understand this error attempted to preform arithmetic (mul) on Instance and Number?

Hi. So i made a sell script in serverscriptservice and its not working. any idea why?

game.ReplicatedStorage.SellEvent.OnServerEvent:Connect(function(player)
	
	local leaderstats = player.leaderstats
	local RoCoin = leaderstats["Ro-Coin"]
	local RoBucks = leaderstats.RoBucks
	local Value = leaderstats.RoValue
	
	RoBucks.Value = RoBucks.Value + RoCoin.Value * Value.Value
	RoCoin.Value = 0
end)
-- above shouldnt be interfereing, the below one is the problem
game.ReplicatedStorage.SellEventDesert.OnServerEvent:Connect(function(player)

	local leaderstats = player.leaderstats
	local RoCoin = leaderstats["Ro-Coin"]
	local RoBucks = leaderstats.RoBucks
	local Value = leaderstats.RoValue
	local selVal = Value *2

	RoBucks.Value = RoBucks.Value + RoCoin.Value * Value.Value 
	RoCoin.Value = 0
end)