Unhandled exception in script error when converting py to exe file

Question

I have a problem in converting py to exe file by pyinstaller as the below error comes

unhandled exception in script.
Failed to execute script 'main' due to unhandled exception: None type object has no attribute 'write'
Traceback (most recent call last):
  File "main.py", line 5, in <module>
  File "pip\__init__.py", line 13, in main
  File "pip\_internal\utils\entrypoints.py", line 35, in _wrapper
AttributeError: 'NoneType' object has no attribute 'write'

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