Script exit with exit code 255

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[3999] Failed to execute script tgnews
Traceback (most recent call last):
  File "tgnews.py", line 518, in <module>
  File "tgnews.py", line 454, in tops
  File "tgnews.py", line 427, in similar_articles
  File "pandas/core/indexing.py", line 205, in __setitem__
  File "pandas/core/indexing.py", line 547, in _setitem_with_indexer
ValueError: Must have equal len keys and value when setting with an iterable