OpenCv - capstone solution

hello again,
I wrote the first few lines for the capstone solution and i received the below error:
cv2.error: OpenCV(4.5.1) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-kh7iq4w7\opencv\modules\imgproc\src\smooth.dispatch.cpp:617:
error: (-215:Assertion failed) !_src.empty() in function 'cv::GaussianBlur'