Repeatedly receiving a "OSError: cannot write mode CMYK as PNG" error

[aimforsilence]

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                 ├┬┘├┤ │  ├┴┐┌─┘ ├─┘└┬┘
                 ┴└─└─┘└─┘└─┘└─┘o┴   ┴

multiprocessing.pool.RemoteTraceback: eroes_077.webp
"""
Traceback (most recent call last):
File "C:\Program Files\Python312\Lib\site-packages\PIL\PngImagePlugin.py", line 1289, in _save
rawmode, mode = _OUTMODES[mode]
~~~~~~~~~^^^^^^
KeyError: 'CMYK'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 125, in worker
result = (True, func(*args, **kwds))
^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 48, in mapstar
return list(map(*args))
^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\util.py", line 95, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\archive.py", line 149, in convert_page_worker
page.save(new_fp)
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\archive.py", line 227, in save
self.fmt.save(self.img, dest)
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\formats.py", line 58, in save
img.save(dest, format='PNG', optimize=True, compress_level=9)
File "C:\Program Files\Python312\Lib\site-packages\PIL\Image.py", line 2459, in save
save_handler(self, fp, filename)
File "C:\Program Files\Python312\Lib\site-packages\PIL\PngImagePlugin.py", line 1292, in _save
raise OSError(msg) from e
OSError: cannot write mode CMYK as PNG
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "", line 198, in run_module_as_main
File "", line 88, in run_code
File "C:\Program Files\Python312\Scripts\recbz.exe_main.py", line 7, in
File "C:\Program Files\Python312\Lib\site-packages\reCBZ_main.py", line 378, in main
wrappers.auto_repack_archive(filename)
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\wrappers.py", line 201, in auto_repack_archive
results = compare_fmts_archive(fp, quiet=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\wrappers.py", line 111, in compare_fmts_archive
results = ComicArchive(fp).compute_fmt_sizes()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\archive.py", line 382, in compute_fmt_sizes
results = map_workers(worker, config.allowed_page_formats(), multithread=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\util.py", line 114, in map_workers
return Tpool.map(func, tasks)
^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 367, in map
return self._map_async(func, iterable, mapstar, chunksize).get()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 774, in get
raise self._value
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 125, in worker
result = (True, func(*args, **kwds))
^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 48, in mapstar
return list(map(*args))
^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\archive.py", line 362, in compute_single_fmt
results = map_workers(worker, sample_pages)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\site-packages\reCBZ\util.py", line 122, in map_workers
return MPpool.map(func, tasks)
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 367, in map
return self._map_async(func, iterable, mapstar, chunksize).get()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\Python312\Lib\multiprocessing\pool.py", line 774, in get
raise self._value
OSError: cannot write mode CMYK as PNG