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Is there a "haarcascade_frontalface_alt.xml" or "haarcascade_eye_tree_eyeglasses.xml" where your exe is, or in your project folder?

Just try to change the two lines with the right path:

String face_cascade_name = "/path/to/the/haarcascade_frontalface_alt.xml";
String eyes_cascade_name = "/path/to/the/haarcascade_eye_tree_eyeglasses.xml";

or (if you are on Windows)

String face_cascade_name = "path\\to\\the\\haarcascade_frontalface_alt.xml";
String eyes_cascade_name = "path\\to\\the\\haarcascade_eye_tree_eyeglasses.xml";

If you do not know what "/path/to/the/" means, it is something like "/home/ninja/opencv/data/haarcascades/", or "C:\\opencv\\data\\haarcascades\\" for Windows

Is there a "haarcascade_frontalface_alt.xml" "haarcascade_frontalface_alt.xml" or "haarcascade_eye_tree_eyeglasses.xml" "haarcascade_eye_tree_eyeglasses.xml" where your exe .exe is, or in your project folder?

Just try to change the two lines with the right path:

String face_cascade_name = "/path/to/the/haarcascade_frontalface_alt.xml";
String eyes_cascade_name = "/path/to/the/haarcascade_eye_tree_eyeglasses.xml";

or (if you are on Windows)

String face_cascade_name = "path\\to\\the\\haarcascade_frontalface_alt.xml";
String eyes_cascade_name = "path\\to\\the\\haarcascade_eye_tree_eyeglasses.xml";

If you do not know what "/path/to/the/" means, it is something like "/home/ninja/opencv/data/haarcascades/", or "C:\\opencv\\data\\haarcascades\\" for Windows