Attempt to connect failed: Passed value is not a function?

player = game.Players.LocalPlayer
playerinWorkspace = player.Character.Name

function addStat(x)
	if player.Stats.Value > 0 then
		if x == "Strength" then
			player.Stats.Strength.Value = player.Stats.Strength.Value + 1
			script.Parent.Parent.Information.STR.Text = "STR: " .. tostring(player.Stats.Strength.Value)
		elseif x == "Agility" then
			player.Stats.Agility.Value = player.Stats.Agility.Value + 1
			script.Parent.Parent.Information.AGI.Text = "AGI: " .. tostring(player.Stats.Agility.Value)
		elseif x == "Intelligence" then
			player.Stats.Intelligence.Value = player.Stats.Intelligence.Value + 1
			script.Parent.Parent.Information.INT.Text = "INT: " .. tostring(player.Stats.Intelligence.Value)
		elseif x == "Defense" then
			player.Stats.Defense.Value = player.Stats.Defense.Value + 1
			script.Parent.Parent.Information.DEF.Text = "DEF: " .. tostring(player.Stats.Defense.Value)
		elseif x == "Vitality" then
			player.Stats.Vitality.Value = player.Stats.Vitality.Value + 1
			script.Parent.Parent.Information.VIT.Text = "VIT: " .. tostring(player.Stats.Vitality.Value)
		elseif x == "Dexterity" then
			player.Stats.Dexterity.Value = player.Stats.Dexterity.Value + 1
			script.Parent.Parent.Information.DEX.Text = "DEX: " .. tostring(player.Stats.Dexterity.Value)
		end
	end
	script.Parent.statPoints.Text = "Status Points: " .. tostring(player.Stats.Value)
end

function onStart()
	script.Parent.statPoints.Text = "Status Points: " .. tostring(player.Stats.Value)
	script.Parent.Parent.Information.STR.Text = "STR: " .. tostring(player.Stats.Strength.Value)
	script.Parent.Parent.Information.AGI.Text = "AGI: " .. tostring(player.Stats.Agility.Value)
	script.Parent.Parent.Information.INT.Text = "INT: " .. tostring(player.Stats.Intelligence.Value)
	script.Parent.Parent.Information.DEF.Text = "DEF: " .. tostring(player.Stats.Defense.Value)
	script.Parent.Parent.Information.VIT.Text = "VIT: " .. tostring(player.Stats.Vitality.Value)
	script.Parent.Parent.Information.DEX.Text = "DEX: " .. tostring(player.Stats.Dexterity.Value)
end

script.Parent.addStr.MouseButton1Click:connect(addStat("Strength"))
script.Parent.addAgi.MouseButton1Click:connect(addStat("Agility"))
script.Parent.addInt.MouseButton1Click:connect(addStat("Intelligence"))
script.Parent.addDef.MouseButton1Click:connect(addStat("Defense"))
script.Parent.addVit.MouseButton1Click:connect(addStat("Vitality"))
script.Parent.addDex.MouseButton1Click:connect(addStat("Dexterity"))
player.CharacterAdded:connect(onStart)

Parameters doesn't work as intended?