title: An index error occurs the moment a face is detected
body: <p>'''</p>
  <pre><code>import cv2
  import numpy as np
  import os
  
  recognizer = cv2.face.LBPHFaceRecognizer_create()
  recognizer.read('trainer/trainer.yml')
  cascadePath = &quot;haarcascade_frontalface_default.xml&quot;
  faceCascade = cv2.CascadeClassifier(cascadePath);
  
  font = cv2.FONT_HERSHEY_SIMPLEX
  
  # iniciate id counter
  id = 0
  
  # names related to ids: example ==&gt; Marcelo: id=1,  etc
  names = ['None', 'Marcelo', 'Paula', 'Ilza', 'Z', 'W']
  
  # Initialize and start realtime video capture
  cam = cv2.VideoCapture(0)
  cam.set(3, 640)  # set video widht
  cam.set(4, 480)  # set video height
  
  # Define min window size to be recognized as a face
  minW = 0.1 * cam.get(3)
  minH = 0.1 * cam.get(4)
  
  while True:
  
      ret, img = cam.read()
      img = cv2.flip(img, -1)  # Flip vertically
  
      gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
  
      faces = faceCascade.detectMultiScale(
          gray,
          scaleFactor=1.2,
          minNeighbors=5,
          minSize=(int(minW), int(minH)),
      )
  
      for (x, y, w, h) in faces:
  
          cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)
  
          id, confidence = recognizer.predict(gray[y:y + h, x:x + w])
  
          # Check if confidence is less them 100 ==&gt; &quot;0&quot; is perfect match 
          if (confidence &lt; 100):
              id = names[id]
              confidence = &quot;  {0}%&quot;.format(round(100 - confidence))
          else:
              id = &quot;unknown&quot;
              confidence = &quot;  {0}%&quot;.format(round(100 - confidence))
  
          cv2.putText(img, str(id), (x + 5, y - 5), font, 1, (255, 255, 255), 2)
          cv2.putText(img, str(confidence), (x + 5, y + h - 5), font, 1, (255, 255, 0), 1)
  
      cv2.imshow('camera', img)
  
      k = cv2.waitKey(10) &amp; 0xff  # Press 'ESC' for exiting video
      if k == 27:
          break
  
  # Do a bit of cleanup
  print(&quot;\n [INFO] Exiting Program and cleanup stuff&quot;)
  cam.release()
  cv2.destroyAllWindows()
  </code></pre>
  <p>'''</p>
  <p>The above personal face identification program encountered the following issues:</p>
  <pre><code>&quot;Traceback (most recent call last):
    File &quot;Z:\OpenCV-Face-Recognition-master\OpenCV-Face-Recognition-master\FacialRecognition\03_face_recognition.py&quot;, line 59, in &lt;module&gt;
      id = names[id]
  IndexError: list index out of range&quot;
  </code></pre>
  <p>Is this a problem with the training data, or is there something wrong with the code itself?</p>