Photomosaic library raising TypeError: slice indices must be integers or None or have an __index__ method

I have the following code (a slightly modified version of this) to create a mosaic from many individual images:

import sys
import photomosaic as phmos
from skimage import io

image = io.imread("r.jpg")

#Get the mosaic size from the command line argument.
mos_size = (int(sys.argv[1]), int(sys.argv[2]))
#can be replaced with mos_size = (100, 100) for non-command line use

#create all image squares and generate pool
phmos.rainbow_of_squares('crks/')
square_pool = phmos.make_pool('crks/*.jpg')

#Create the mosaic image and save
mosaic = phmos.basic_mosaic(image, square_pool, mos_size)
io.imsave('mosaic_op.png', mosaic)

However, when running it (both from command line and in the terminal) I get the following error:

Traceback (most recent call last):
  File "/home/GVA/corks/create_mosaic.py", line 15, in <module>
    mosaic = phmos.basic_mosaic(image, square_pool, mos_size)
  File "/home/GVA/.local/lib/python3.10/site-packages/photomosaic/photomosaic.py", line 102, in basic_mosaic
    image = rescale_commensurate(image, grid_dims, depth)
  File "/home/GVA/.local/lib/python3.10/site-packages/photomosaic/photomosaic.py", line 218, in rescale_commensurate
    return crop_to_fit(image, new_shape)
  File "/home/GVA/.local/lib/python3.10/site-packages/photomosaic/photomosaic.py", line 873, in crop_to_fit
    cropped = crop(resized, crop_width)
  File "/usr/local/lib/python3.10/site-packages/skimage/util/arraycrop.py", line 72, in crop
    cropped = ar[slices]
TypeError: slice indices must be integers or None or have an __index__ method

What is causing this error, and how can I fix it?

Based off of this answer:

Go to the source files of the photomosaic library (see how to find them here), and open photomosaic.py. Then, go to lines 867 & 868:

        left_margin = np.floor(overflow / 2)
        right_margin = np.ceil(overflow / 2)

And modify them like so:

        left_margin = int(np.floor(overflow / 2))
        right_margin = int(np.ceil(overflow / 2))