Issues with Tables and Their Lengths

Completed To-Do List Program Link: https://pastebin.com/Wnb72pGT

Pastebin link: https://pastebin.com/hTiXQP0W

monitor = peripheral.wrap("right")
monitor.clear()

local function screenRefresh()
monitor.clear()
monitor.setCursorPos(1,1)
local x, y = term.getCursorPos()
monitor.write("	 THE GRAND TODO LIST!")
y=y+1
monitor.setCursorPos(x,y)
  for i = 1,#Table do
	 monitor.write("Table[i]")
	 monitor.setCursorPos(x,y)
	 y=y+1
  end
end

local Table = {}

print(#Table)

local input = ""
local numin = 0
local taskin = ""
while true do
  print("What would you like to do?")
  print("1) Add new item.")
  print("2) Remove item.")
  print("3) Refresh List.")
  input = read()
  if (input == "1") and (#Table < 15) then
	print("New Item:")
	taskin = read()
	table.insert(Table, taskin)
	print(#Table)
   -- screenRefresh()
  elseif #Table > 15 then
	print("Sorry, the list is full!")
  end
  if (input == "2") then
	print("Which item should I remove?")
	numin = tonumber(read())
	table.remove(Table, numin)
	screenRefresh()
  end
  if (input == "3") then
	screenRefresh()
  end
end

Trying to figure out why any call to screenRefresh crashes with "monitor:11: attempt to get length of nil", even if the table (named Table) has elements manually inserted before running,

Any feedback/potential solutions would be greatly appreciated!

You need to declare Table above the function (and should probably use a different name for it), otherwise the function won't see it. The table must already be declared when you declare the function.

Thanks for your help Lyqyd, program works as intended now!