error: (-215) !empty() in function detectMultiScale

by

I had the same issue.

I didn’t need to download anything else to solve this. CV2 had everything I needed.

Instead of trying to figure out where the .xml files are and hard coding the values, I used a property given by cv2.

From OP

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')

Becomes 

face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_eye.xml')

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