The code is the following: import numpy as np import cv2 img=cv2.imread('capstone_coins.png',cv2.IMREAD_GRAYSCALE) original_image=cv2.imread('capstone_coins.png',1) img=cv2.GaussianBlur(img,(5,5),0) cv2.imshow('Detected Coins',original_image) cv2.waitKey(0) cv2.destroyAllWindows() But this gives me the following error: [ WARN:0@0.019] global D:\bld\libopencv_1656375874586\work\modules\imgcodecs\src\loadsave.cpp (239) cv::findDecoder imread_('capstone_coins.png'): can't open/read file: check file path/integrity [ WARN:0@0.020] global D:\bld\libopencv_1656375874586\work\modules\imgcodecs\src\loadsave.cpp (239) cv::findDecoder imread_('capstone_coins.png'): can't open/read file: check file path/integrity Traceback (most recent call last): File "c:\Users\Alega\Desktop\Cartelle\Mie\Webinar, corsi e video generici\365 Data Science Course\Career tracks\Data scientist\4 - Python Programmer Bootcamp\File creati da Visual Studio Code\capstone_solution.py", line 6, in <module> img=cv2.GaussianBlur(img,(5,5),0) cv2.error: OpenCV(4.5.5) D:\bld\libopencv_1656375874586\work\modules\imgproc\src\smooth.dispatch.cpp:617: error: (-215:Assertion failed) !_src.empty() in function 'cv::GaussianBlur' I already have capstone_coins.png and capstone_solution.py in the same folder, too

I think I have solved this problem: the first time we use Visual Studio Code, we should have on the left side a button with the wording "Open folder". We have to click on that folder and to select the folder in which we have the image and the .py file. I hope this can be useful to other people.