@Xqt Hi! As you've listed this task as a good first task, more details in the task description are welcome. Maybe add where and how one can reproduce this error, link to the codebase, some hints/ideas for fixing the issue, etc. It might be easier that way for a newcomer to get started :)

If you think this task may not be too easy for a newcomer, consider removing the good first task tag.

See https://gerrit.wikimedia.org/r/plugins/gitiles/pywikibot/core/+/2d2a818c10689187439b681aee73f542effb36d2/pywikibot/proofreadpage.py

The whole loop in line 603 has finished after 5 retried but the code must not continue with line 621 which is noted in trackback above it must just return with the other failing exception inside the while loop like:

for retries in range(5):
  try:
    <read the data>
  except <Exception1>:
    return <values for this>
  except <Exception2>:
    pass
  else:
    break
else:
  return <values for that max retries of Exeption2>

continue the method

Urgent response required

Change 567213 had a related patch set uploaded (by Xqt; owner: Xqt):
[pywikibot/core@master] [bugfix] Fix UnboundLocalError in ProofreadPage._ocr_callback

https://gerrit.wikimedia.org/r/567213

Change 567213 merged by jenkins-bot:
[pywikibot/core@master] [bugfix] Fix UnboundLocalError in ProofreadPage._ocr_callback

https://gerrit.wikimedia.org/r/567213