Error in indexing with a multi dimensional array

When I am trying to index my multi dimensional array inside a method. I get the error…
" Maze37: Attempt index nil with number ".

Here is the Maze Script

local Maze = {}
Maze.__index = Maze

local Cell = require( script.Cell )
local multiDemArray = require( game.ReplicatedStorage.Modules.MultiArray )
--------------------------

grid = multiDemArray.new()

--------------------------

function Maze.new( ncols, nrows , width )
	local self = setmetatable( {} , Maze )
	
	self.cols = ncols
	self.rows = nrows
	
	for i=1, self.cols do
		for j=1, self.rows do
			local Cell = Cell.new( i , j , width )
			
			Cell:Show()
			
			grid[i][j] = Cell	
			
		end
	end
	
	return self
end

function Maze:Update()	
	grid[ math.random( self.cols ) ][ math.random( self.rows ) ].Part.BrickColor =  BrickColor.new("Crimson")	 
	
end

--------------------------

return Maze

And here is my module for creating the multi dimensional array…

local dimensionalTable = {}

dimensionalTable.__index = function(table, index)
	if rawget(table, index) == nil then 
		rawset(table, index, setmetatable({}, dimensionalTable)) 
	end
end

dimensionalTable.new = function()
	return setmetatable({}, dimensionalTable)
end

return dimensionalTable

Can someone please explain to me what I’m doing wrong here because I cant see anything??

Figured it out btw I forgot got to set my new Maze Object to a variable lol.

:stuck_out_tongue_winking_eye: