whenever I try to run the code with Lua I get the error :Error Map.lua:107: attempt to call method 'makepyramid' (a nil value) - visual-studio-code

Question

Map = Class{}
TILE_BRICK = 1
TILE_EMPTY = -1
POLE_TOP = 8
POLE_MIDDLE = 12
POLE_BOTTOM = 16
FLAG_TILE = 13
local SCROLL_SPEED = 62
function Map:init()
self.spritesheet = love.graphics.newImage('graphics/spritesheet.png')
self.sprites = generateQuads(self.spritesheet, 16, 16)
self.music = love.audio.newSource('sounds/music.wav', 'static')
self.tileWidth = 16
self.tileHeight = 16
self.mapWidth = 30
self.mapHeight = 28
self.tiles = {}
self.flag = self.mapWidth - 3
self.pyramid = self.mapWidth - 4
self.pyramidHeight = 8
self.gravity = 15
-- associate player with map
self.player = Player(self)
-- camera offsets
self.camX = 0
self.camY = -3
self.mapWidthPixels = self.mapWidth * self.tileWidth
self.mapHeightPixels = self.mapHeight * self.tileHeight
for y = 1, self.mapHeight do
for x = 1, self.mapWidth do
self:setTile(x, y, TILE_EMPTY)
end
end
local x = 1
while x < self.mapWidth do
if x == self.flag then
self:setTile(x, (self.mapHeight / 2) - 3, POLE_TOP)
self:setTile(x, (self.mapHeight / 2) - 2, POLE_MIDDLE)
self:setTile(x, (self.mapHeight / 2) - 1, POLE_BOTTOM)
self:setTile(x+1, (self.mapHeight / 2) - 3, FLAG_TILE)
for y = self.mapHeight / 2, self.mapHeight do
self:makepyramid(x, y, TILE_BRICK)
end
self:setTile(self.flag)
x = x+1
end
This the code that I have written it does require other files to work but the core problem exists within this code: most probably with "makepyramid" in "map init()"
please suggest some possible changes that I can make to make this code work properly. comment down if you need more chunks of code to try some solutions.