weird error: "score is not a valid member of IntValue", what does this mean?

trying to make a score leaderboard and I get this error i modified a kills and death leaderboard online, so thats how i got this code.

game.Players.PlayerAdded:connect(function(plr)
	
     local leaderstats = Instance.new("IntValue",plr)	
     leaderstats.Name = "leaderstats" -- dont change the name or else it will not work!
     
     local Death = Instance.new("IntValue")
     Death.Name =  script.DeathsName.Value -- The Value with be in the script
 
     local Kills = Instance.new("IntValue")
	 Kills.Name = script.KillsName.Value -- The Value with be in the script
	 local score = Instance.new("IntValue")
	score.Name = "Score"
	score.Parent = leaderstats
	plr.leaderstats.score.Value = Kills * 10 - Death * 5
end)

may someone help me with this code?