title: faces = faceCascade.detectMultiScale(imgGray,1.3,5)
body: <pre><code>faces = faceCascade.detectMultiScale(imgGray,1.3,5)
  </code></pre>
  <blockquote>
  <p>cv2.error: OpenCV(4.4.0) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-6sxsq0tp\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'</p>
  </blockquote>