How do I approach fixing this tuple length error in read_mist_models?

Question

Here's the code I used:

import read_mist_models

filename = 'MIST_iso_61ca3125bac7d.iso.cmd'
iso = read_mist_models.ISOCMD(filename)

Here's the error I'm getting (added the arrows):

ValueError                                Traceback (most recent call last)
<ipython-input-35-4ce42af33094> in <cell line: 4>()
2 
3 filename = 'MIST_iso_61ca3125bac7d.iso.cmd'
---> 4 iso = read_mist_models.ISOCMD(filename)

1 frames
/content/read_mist_models.py in read_isocmd_file(self)
180             for eep in range(num_eeps):
181                 isocmd_chunk = data[3+counter+eep]
---> 182            isocmd[eep]=tuple(isocmd_chunk)
183             isocmd_set.append(isocmd)
184             ages.append(isocmd[0][1])
 
ValueError: could not assign tuple of length 34 to structure with 33 fields.

Here's a link to the repo with the read_mist_models module: https://github.com/jieunchoi/MIST_codes/blob/master/scripts/read_mist_models.py

I tried to read through the module and couldn't really understand what was happening. I was expecting it to just say "Reading in: MIST_iso_61ca3125bac7d.iso.cmd" (which it did) with no errors.