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Here's the thread: Traceback (most recent call last): File "/home/MmBaguette/mysite/create_book.py", line 25, in <module> def hello_world(checking, URLs): File "/usr/lib/python3.8/site-packages/flask/app.py", line 1314, in decorator self.add_url_rule(rule, endpoint, f, **options) File "/usr/lib/python3.8/site-packages/flask/app.py", line 98, in wrapper_func Traceback (most recent call last): File "/home/MmBaguette/mysite/create_book.py", line 8, in <module> from readhtml import get_text_images File "./readhtml.py", line 3, in <module> Traceback (most recent call last): File "/home/MmBaguette/mysite/create_book.py", line 8, in <module> from readhtml import get_text_images File "./readhtml.py", line 3, in <module> import imagehash File "/home/MmBaguette/.local/lib/python3.8/site-packages/imagehash.py", line 34, in <module> from PIL import Image, ImageFilter File "/usr/lib/python3.8/site-packages/PIL/ImageFilter.py", line 23, in <module> File "/usr/lib/python3.8/site-packages/numpy/core/__init__.py", line 17, in <module> import numpy File "/usr/lib/python3.8/site-packages/numpy/__init__.py", line 142, in <module> from . import core File "/usr/lib/python3.8/site-packages/numpy/core/__init__.py", line 17, in <module> from . import multiarray File "/usr/lib/python3.8/site-packages/numpy/core/multiarray.py", line 14, in <module> from . import overrides File "/usr/lib/python3.8/site-packages/numpy/core/overrides.py", line 16, in <module> add_docstring( RuntimeError: implement_array_function method already has a docstring

The error occurs when I import the PIL-based imagehash module.

Hi, that is a known numpy issue: https://github.com/numpy/numpy/issues/14384 . Also, please check this forum thread, as it could include some hints: https://www.pythonanywhere.com/forums/topic/28100/.