Problems with pytmx

[Piethon]

Merry Christmas too all of you out there.

I have a problem with pytmx, as you can already say from the title of this thread.
So I have made a class to load the map, that I made with the application "Tiled":

class TiledMap:
    def __init__(self, filename):
        tm = pytmx.load_pygame(filename, pixelalpha=True)
        self.width = tm.width * tm.tilewidth
        self.height = tm.height * tm.tileheight
        self.tmxdata = tm

    def render(self, surface):
        ti = self.tmxdata.get_tile_image_by_grid
        for layer in self.tmxdata.visible_layers:
            if isinstance(layer, pytmx.TiledTileLayer):
                for x, y, gid, in layer:
                    tile = ti(gid)
                    if tile:
                        surface.blit(tile, (x * self.tmxdata.tilewidth, y * self.tmxdata.tileheight))

    def make_map(self):
        temp_surface = pg.Surface((self.width, self.height))
        self.render(temp_surface)
        return temp_surface

I am loading it in the load section of my main.py file:

self.map = TiledMap(path.join(map_folder, 'outdoor.tmx'))
self.map_img = self.map.make_map()
self.map_rect = self.map_img.get_rect()

But still I get this error:

Traceback (most recent call last):
  File "/Users/.../Desktop/MyRPG/main.py", line 5172, in <module>
    g = Game()
  File "/Users/.../Desktop/MyRPG/main.py", line 16, in __init__
    self.load_data()
  File "/Users/.../Desktop/MyRPG/main.py", line 62, in load_data
    self.map = TiledMap(path.join(map_folder, 'outdoor.tmx'))
  File "/Users/.../Desktop/MyRPG/tilemap.py", line 22, in __init__
    tm = pytmx.load_pygame(filename, pixelalpha=True)
AttributeError: module 'pytmx.pytmx' has no attribute 'load_pygame'

Any idea how to fix this?
Merry Christmas.