I actually made a jumping jacks script, and it's not working. Can anyone show me my error?

So, I made a jumping jacks script. That when you jump it chats the number. But it seems like it's not working. Where is my error?

local User = game:GetService("VirtualUser")
local plr = game.Players.LocalPlayer
local isDoingJacks = false
local MaxAmnt = 999
local MinAmnt = 1
local AmountToDo = 1
local Count = 0
local kpCodes = {["A"] = "0x41", ["B"] = "0x42", ["C"] = "0x43", ["D"] = "0x44", ["E"] = "0x45", ["F"] = "0x46", ["G"] = "0x47", ["H"] = "0x48", ["I"] = "0x49", ["J"] = "0x4A", ["K"] = "0x4B", ["L"] = "0x4C", ["M"] = "0x4D", ["N"] = "0x4E", ["O"] = "0x4F", ["P"] = "0x50", ["Q"] = "0x51", ["R"] = "0x52", ["S"] = "0x53", ["T"] = "0x54", ["U"] = "0x55", ["V"] = "0x56", ["W"] = "0x57", ["X"] = "0x58", ["Y"] = "0x59", ["Z"] = "0x5A"}
local stringNumbers_Ones = {["0"] = "ZERO", ["1"] = "ONE", ["2"] = "TWO", ["3"] = "THREE", ["4"] = "FOUR", ["5"] = "FIVE", ["6"] = "SIX", ["7"] = "SEVEN", ["8"] = "EIGHT", ["9"] = "NINE"}
local stringNumbers_Tens = {["10"] = "TEN", ["20"] = "TWENTY", ["30"] = "THIRTY", ["40"] = "FORTY", ["50"] = "FIFTY", ["60"] = "SIXTY", ["70"] = "SEVENTY", ["80"] = "EIGHTY", ["90"] = "NINTY"}
local stringNumbers_Hundreds = {["100"] = "ONEHUNDRED", ["200"] = "TWOHUNDRED", ["300"] = "THREEHUNDRED", ["400"] = "FOURHUNDRED", ["500"] = "FIVEHUNDRED", ["600"] = "SIXHUNDRED", ["700"] = "SEVENHUNDRED", ["800"] = "EIGHTHUNDRED", ["900"] = "NINEHUNDRED"}
function ArrayToString(Array)
	local String = ""
    for i, v in ipairs(Array) do 
        String = String..tostring(v)
    end
    return String
end
function StringToArray(String)
	local Array = {}
    for i = 1, String:len() do
        table.insert(Array, String:sub(i,i))
    end
    return Array
end
function NumToStr(num)
	local str = tostring(num)
	local final_str = {}
	if string.len(str) == 1 then 
		local final_str = StringToArray(stringNumbers_Ones[str])
		table.insert(final_str, stringNumbers_Ones[str])
		return final_str
	elseif string.len(str) == 2 then 
		local final_str = StringToArray(stringNumbers_Tens[str])
		table.insert(final_str, stringNumbers_Tens[str])
		return final_str
	elseif string.len(str) == 3 then
		return str
	else
		return "Unsupported Number"
	end
end
function KeyUp()
	User:SetKeyUp(" ")
end	
function KeyDown()
	User:SetKeyDown(" ")
end
function Jump(wt)
	if wt then wait(wt) else wait(1) end
	KeyUp()
	wait()
	KeyDown()
	wait()
	KeyUp()
end
function Chat(msg, capital)
	wait()
	if capital then
		keypress(0x14) 
		keypress(tonumber(kpCodes[string.upper(msg)]))
		keypress(0x14)
		keypress(0x0D)
	else
		if msg:len() > 2 then
			local strin = {}
			for index, value in ipairs(StringToArray(msg)) do
				table.insert(strin, kpCodes[string.upper(value)])
			end
			for a, b in ipairs(strin) do
				keypress(tonumber(b))
			end
			keypress(0x0D)
		else
			keypress(tonumber(kpCodes[string.upper(msg)]))
			wait()
			keypress(0x0D)
		end
	end
	wait()
end
function Intialize(numberOfJumps)
	for a = 1, numberOfJumps, 1 do
		for i, v in ipairs(NumToStr(a)) do 
			wait()
			Chat(v)
			Jump()
		end
	end
end
wait(1)
Intialize(1)

You proiblem is that your using stringNumbers_ in the wrong co routine. The metatables are essential when defining what you want to be referencing in the co routine. The IPairs is also not rooted to humanoid root part which creates a whole other seperate set of problems. This is my input to my best knowledge, sorry if any mistakes I try my best

-TheBestScripter0