I uploaded a new issue to OpenCV.
Anyway, I would like to copy my problem here as well.
I am using OpenCV 4.5.4 on Ubuntu 22.04.
This is my first time, so I am trying to practice the openCV by following this website:
This example is about how to do camera calibration using XML ( I can tell )
So I copied the camera_calibration.cpp file, also the XML files based on their guidance.
I guess my error is coming from here:
I am not sure how to put the right path in my case.