Troubleshooting

NumPy

Windows 10 20H2

If you get this error:

 ** On entry to DGEBAL parameter number  3 had an illegal value
 ** On entry to DGEHRD  parameter number  2 had an illegal value
 ** On entry to DORGHR DORGQR parameter number  2 had an illegal value
 ** On entry to DHSEQR parameter number  4 had an illegal value
Traceback (most recent call last):
  File "C:\dev\lang\Python38\lib\site-packages\numpy\__init__.py", line 305, in <module>
    _win_os_check()
  File "C:\dev\lang\Python38\lib\site-packages\numpy\__init__.py", line 302, in _win_os_check
    raise RuntimeError(msg.format(__file__)) from None
RuntimeError: The current Numpy installation ('C:\\dev\\lang\\Python38\\lib\\site-packages\\numpy\\__init__.py') fails to pass a sanity check due to a bug in the windows runtime. See this issue for more information: https://tinyurl.com/y3dm3h86
Traceback (most recent call last):
  File "upscale.py", line 8, in <module>
    import cv2
  File "C:\dev\lang\Python38\lib\site-packages\cv2\__init__.py", line 5, in <module>
    from .cv2 import *
ImportError: numpy.core.multiarray failed to import

You can solve this by downgrading to NumPy 1.19.3

pip install numpy==1.19.3

This is an issue that Microsoft needs to fix, a fix is expected to come out in January of 2021. Until then, you should use the old version on Windows.