attempt to index nil with 'Humanoid' error using alvinblox tutorials?

I was following alvinblox tutorials and this error came up: attempt to index nil with 'Humanoid' can anybody help me?

local serverStorage = game:GetService("ServerStorage")
local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerSave3")

game.Players.PlayerAdded:Connect(function(player)
	
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player
	
	local strength = Instance.new("NumberValue")
	strength.Name = "Strength"
	strength.Parent = leaderstats
	
	local rebirths = Instance.new("IntValue")
	rebirths.Name = "Rebirths"
	rebirths.Parent = leaderstats
	
	local dataFolder = Instance.new("Folder")
	dataFolder.Name = player.Name
	dataFolder.Parent = serverStorage.RemoteData
	
	local debounce = Instance.new("BoolValue")
	debounce.Name = "Debounce"
	debounce.Parent = dataFolder
	
	local strengthData, rebirthsData
	
	local success,errormessage = pcall(function()
		strengthData = DataStore:GetAsync("strength-"..player.UserId)
		rebirthsData = DataStore:GetAsync("rebirths-"..player.UserId)
	end)
	
	if success then
		if strengthData then
			strength.Value = strengthData
			rebirths.Value = rebirthsData
		end
	end
	
	player.CharacterAppearanceLoaded:Connect(function()
		local humanoid = character.Humanoid--here is the error
		humanoid:WaitForChild("BodyDepthScale").Value = .5 + (strength / 250)
		humanoid:WaitForChild("BodyHeightScale").Value = .5 + (strength.Value / 250)
		humanoid:WaitForChild("BodyWidthScale").Value = .5 + (strength / 250)
		humanoid:WaitForChild("HeadScale").Value = .5 + (strength / 250)
		humanoid.Walkspeed = 16 * (strength.Value / 250)
		
		strength:GetPropertyChangedSignal("Value"):Connect(function()
			humanoid:WaitForChild("BodyDepthScale").Value = .5 + (strength / 250)
			humanoid:WaitForChild("BodyHeightScale").Value = .5 + (strength.Value / 250)
			humanoid:WaitForChild("BodyWidthScale").Value = .5 + (strength / 250)
			humanoid:WaitForChild("HeadScale").Value = .5 + (strength / 250)
			humanoid.Walkspeed = 16 * (strength.Value / 250)
		end)
	end)
	
end)

game.Players.PlayerRemoving:Connect(function(player)
	local success, errormessage = pcall(function()
		DataStore:SetAsync("strength-"..player.UserId,player.leaderstats.Strength.Value)
		DataStore:SetAsync("rebirths-"..player.UserId,player.leaderstats.Rebirths.Value)
	end)
end)

nvm I realized what I did do

    player.CharacterAppearanceLoaded:Connect(function()

what I need to do

player.CharacterAppearanceLoaded:Connect(function(character)

I needed to put in word character