Face recognition with opencv and python

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I am trying to implement the real-time face recognition using opencv and python. Each time i open my detector it gets stuck and gives error, could please help ?

import cv2
import numpy as np

recognizer = cv2.face.createLBPHFaceRecognizer()
recognizer.load('trainner/trainner.yml')
cascadePath = "haarcascade_frontalface_default.xml"
faceCascade = cv2.CascadeClassifier(cascadePath);


cam = cv2.VideoCapture(0)
font = (cv2.FONT_HERSHEY_SIMPLEX, 1, 1, 0, 1, 1)
while True:
    ret, im =cam.read()
    gray=cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
    faces=faceCascade.detectMultiScale(gray, 1.2,5)
    for(x,y,w,h) in faces:
        cv2.rectangle(im,(x,y),(x+w,y+h),(225,0,0),2)
        Id, conf = recognizer.predict(gray[y:y+h,x:x+w])
        if(conf<50):
            if(Id==1):
                Id="Anirban"
            elif(Id==2):
                Id="Sam"
        else:
            Id="Unknown"
        cv2.cv.PutText(cv2.cv.fromarray(im),str(Id), (x,y+h),font, 255)
    cv2.imshow('im',im) 
    if cv2.waitKey(10) & 0xFF==ord('q'):
        break
cam.release()
cv2.destroyAllWindows()

The error:

   TypeError                                 Traceback (most recent call last)
    <ipython-input-1-91c07dcf5ed1> in <module>()
         16     for(x,y,w,h) in faces:
         17         cv2.rectangle(im,(x,y),(x+w,y+h),(225,0,0),2)
    ---> 18         Id, conf = recognizer.predict(gray[y:y+h,x:x+w])
         19         if(conf<50):
         20             if(Id==1):

    TypeError: 'int' object is not iterable