I spent a few hours writing the MasterScript for my RPG game I'm working on, but for some reason it doesn't assign all of the values listed in the assignValues function like I tell it to. In the output, it gives me, "Gold is not a valid member of Player" in bold red letters. Here's my code, I'm not sure what's wrong specifically because right now nothing is working (and I know that my Hierarchy is correct): And also, as a note, it is in a LocalScript.

--Player value Variables
Gold = Instance.new("NumberValue")
Gems = Instance.new("NumberValue")
PlayerLevel = Instance.new("NumberValue")
Exp = Instance.new("NumberValue")
HP = Instance.new("NumberValue")
Quest1 = Instance.new("BoolValue")
Quest2 = Instance.new("BoolValue")
Quest3 = Instance.new("BoolValue")
Quest4 = Instance.new("BoolValue")
Quest5 = Instance.new("BoolValue")
Player = game.Players.LocalPlayer
Gold = 10
Gems = 0
PlayerLevel = 1

--Gui frame variables
ScreenGui = game.StarterGui.ScreenGui
ShopBG = ScreenGui.ShopBG
QuestsBG = ScreenGui.QuestsBG
StatsBG = ScreenGui.StatsBG
OptionsBG = ScreenGui.OptionsBG

--Start of functions
wait(3)

function assignValues() --assigns LocalPlayer all necessary values
repeat wait() until Player --waits until Player is loaded before assigning values
	Gold.Parent = Player
	Gold.Name = "Gold"
	Gold.Value = 10
	Gems.Parent = Player
	Gems.Name = "Gems"
	Gems.Value = 0
	PlayerLevel.Parent = Player
	PlayerLevel.Name = "PlayerLevel"
	PlayerLevel.Value = 1
	Exp.Parent = Player
	Exp.Name = "Exp"
	HP.Parent = Player
	HP.Name = "HP"
	Quest1.Parent = Player
	Quest1.Name = "Quest1"
	Quest1.Value = false
	Quest2.Parent = Player
	Quest2.Name = "Quest2"
	Quest2.Value = false
	Quest3.Parent = Player
	Quest3.Name = "Quest3"
	Quest3.Value = false
	Quest4.Parent = Player
	Quest4.Name = "Quest4"
	Quest4.Value = false
	Quest5.Parent = Player
	Quest5.Name = "Quest5"
	Quest5.Value = false
end


while true do
	if Player.Exp.Value >= 100 then
		Player.PlayerLevel.Value = 2
	elseif Player.Exp.Value >= 300 then
		Player.PlayerLeve.Valuel = 3
	elseif Player.Exp.Value >= 600 then
		Player.PlayerLeve.Valuel = 4
	elseif Player.Exp.Value >= 1000 then
		Player.PlayerLevel.Value = 5
	elseif Player.Exp.Value >= 1500 then
		Player.PlayerLevel.Value = 6
	elseif Player.Exp.Value >= 2000 then
		Player.PlayerLevel.Value = 7
	elseif Player.Exp.Value >= 2500 then
		Player.PlayerLevel.Value = 8
	elseif Player.Exp.Value >= 3000 then
		Player.PlayerLevel.Value = 9
	elseif Player.Exp.Value >= 4000 then
		Player.PlayerLevel.Value = 10
	elseif Player.Exp.Value >= 5000 then
		Player.PlayerLevel.Value = 11
	elseif Player.Exp.Value >= 6500 then
		Player.PlayerLevel.Value = 12
	elseif Player.Exp.Value >= 8000 then
		Player.PlayerLevel.Value = 13
	elseif Player.Exp.Value >= 9500 then
		Player.PlayerLevel.Value = 14
	elseif Player.Exp.Value >= 11000 then
		Player.PlayerLevel.Value = 15
	elseif Player.Exp.Value >= 12500 then
		Player.PlayerLevel.Value = 16
	elseif Player.Exp.Value >= 14000 then
		Player.PlayerLevel.Value = 17
	elseif Player.Exp.Value >= 15500 then
		Player.PlayerLevel.Value = 18
	elseif Player.Exp.Value >= 18000 then
		Player.PlayerLevel.Value = 19
	elseif Player.Exp.Value >= 21000 then
		Player.PlayerLevel.Value = 20
	elseif Player.Exp.Value >= 25000 then
		Player.PlayerLevel.Value = 21
	elseif Player.Exp.Value >= 30000 then
		Player.PlayerLevel.Value = 22
	elseif Player.Exp.Value >= 35000 then
		Player.PlayerLevel.Value = 23
	elseif Player.Exp.Value >= 40000 then
		Player.PlayerLevel.Value = 24
	elseif Player.Exp.Value >= 45000 then
		Player.PlayerLevel.Value = 25
	elseif Player.Exp.Value >= 50000 then
		Player.PlayerLevel.Value = 26
	elseif Player.Exp.Value >= 57500 then
		Player.PlayerLevel.Value = 27
	elseif Player.Exp.Value >= 65000 then
		Player.PlayerLevel.Value = 28
	elseif Player.Exp.Value >= 72500 then
		Player.PlayerLevel.Value = 29
	elseif Player.Exp.Value >= 82500 then
		Player.PlayerLevel.Value = 30
	elseif Player.Exp.Value >= 100000 then
		Player.PlayerLevel.Value = 31
	else
	print("An error has occured with the LevelUp Function.")
	end
end

while true do
	if Player.PlayerLevel.Value == 1 then
		Player.HP.Value = 300
	elseif Player.PlayerLevel.Value == 2 then
		Player.HP.Value = 400
	elseif Player.PlayerLevel.Value == 3 then
		Player.HP.Value = 500
	elseif Player.PlayerLevel.Value == 4 then
		Player.HP.Value = 600
	elseif Player.PlayerLevel.Value == 5 then
		Player.HP.Value = 700
	elseif Player.PlayerLevel.Value == 6 then
		Player.HP.Value = 800
	elseif Player.PlayerLevel.Value == 7 then
		Player.HP.Value = 900
	elseif Player.PlayerLevel.Value == 8 then
		Player.HP.Value = 1000
	elseif Player.PlayerLevel.Value == 9 then
		Player.HP.Value = 1100
	elseif Player.PlayerLevel.Value == 10 then
		Player.HP.Value = 1200
	elseif Player.PlayerLevel.Value == 11 then
		Player.HP.Value = 1300
	elseif Player.PlayerLevel.Value == 12 then
		Player.HP.Value = 1400
	elseif Player.PlayerLevel.Value == 13 then
		Player.HP.Value = 1500
	elseif Player.PlayerLevel.Value == 14 then
		Player.HP.Value = 1600
	elseif Player.PlayerLevel.Value == 15 then
		Player.HP.Value = 1700
	elseif Player.PlayerLevel.Value == 16 then
		Player.HP.Value = 1800
	elseif Player.PlayerLevel.Value == 17 then
		Player.HP.Value = 1900
	elseif Player.PlayerLevel.Value == 18 then
		Player.HP.Value = 2000
	elseif Player.PlayerLevel.Value == 19 then
		Player.HP.Value = 2100
	elseif Player.PlayerLevel.Value == 20 then
		Player.HP.Value = 2200
	elseif Player.PlayerLevel.Value == 21 then
		Player.HP.Value = 2300
	elseif Player.PlayerLevel.Value == 22 then
		Player.HP.Value = 2400
	elseif Player.PlayerLevel.Value == 23 then
		Player.HP.Value = 2500
	elseif Player.PlayerLevel.Value == 24 then
		Player.HP.Value = 2600
	elseif Player.PlayerLevel.Value == 25 then
		Player.HP.Value = 2700
	elseif Player.PlayerLevel.Value == 26 then
		Player.HP.Value = 2800
	elseif Player.PlayerLevel.Value == 27 then
		Player.HP.Value = 2900
	elseif Player.PlayerLevel.Value == 28 then
		Player.HP.Value = 3000
	elseif Player.PlayerLevel.Value == 29 then
		Player.HP.Value = 3100
	elseif Player.PlayerLevel.Value == 30 then
		Player.HP.Value = 3200
	elseif Player.PlayerLevel.Value == 31 then
		Player.HP.Value = 3300
	else
	print("An error has occured with the byLevelHP Function.")
	end
end

function assignHP()
	Player.MaxHealth = Player.HP.Value
	Player.Health = Player.HP.Value
end


game.Players.PlayerAdded:connect(assignValues)
game.Players.PlayerAdded:connect(assignHP)

This wouldn't even run properly. You can't have two while loops running in the same function.

There are many things wrong with this piece of code.

One) That is a horrible way to code this.

USE A TABLE. THAT IS WHY WE HAVE LISTS. GOODNESS.

The HP doesn't even need a table!

Lines 191 to 127 can be replaced with:

Player.HP.Value = 200 + 100 * Player.PlayerLevel.Value;

64 fewer lines!!!!

Similarly...

local xps = {0, 100, 300, 600, 1000, 1500, 2000, 2500, 3000, 4000, 5000, 6500, 8000, 9500, 11000, 12500, 14000, 15500, 18000, 21000, 25000, 30000, 35000, 40000, 45000, 50000, 57500, 65000, 72500, 82500, 100000};
local xp = Player.Exp.Value;
local level = 1;
while xps[level] and xps[level] <= xp do
	level = level + 1;
end

Replaces lines 123 to 61. 56 few lines!!!

There were several typos in all of the junk you had before. That's why you don't want to do that.

Debug this much simpler thing first.

Two) You cannot concurrently run two while loops.

Execution happens in succession; the first loop will continue and never stop.

Interleave the contents into a single while loop.

Similarly, the connection has to be executed before the loop, as the loop will not end.

Three) You are using both LocalPlayer and PlayerAdded.

You are reassigning the local player's leaderstats any time anyone else joins. That is definitely wrong. Generating leaderestats is not something a LocalScript has business doing. Do that with a separate server Script.

Four) Nothing in this script can trigger the error you posted;

something else is erroring (probably because this script is wrong in the above stated ways; the error is caused by reason Two + Three probably). Please actually try to debug wholeheartedly to help us: give the error but also understand it, e.g., it isn't from this script!