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Code for opencv text detection from video not working.

I have this code for text detection but it has not been working.

import cv2
import numpy as np
#from pytesser import *

def text_detection():
    cap=cv2.VideoCapture(0)
    cap.open(0)
    while True:
        ret,img=cap.read()
        img2gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
        ret1,mask= cv2.threshold(img2gray,180,255,cv2.THRESH_BINARY)
        image_final=cv2.bitwise_and(img2gray,img2gray,mask=mask)
        ret2,new_img= cv2.threshold(image_final,180,255,cv2.THRESH_BINARY)
        kernel=cv2.getStructuringElement(cv2.MORPH_CROSS,(3,3))
        dilated=cv2.dilate(new_img,kernel,iterations=9)

        idk,contours,hierarchy=cv2.findContours(dilated,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_NONE)
        index =0
        for contour in contours:
            [x,y,w,h]=cv2. boundingRect(contour)

            if w<35 and h<35:
                continue

            cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,255),2)

        cv2.imshow('text_detect',img)
        k=cv2.waitKey(1)& 0xff
        if k==ord('q'):
            break
        cap.release()
        cv2.destroyAllWindows()



text_detection()

and it gives me this error:
Traceback (most recent call last):
  File "C:Python27cvvidcheck.py", line 36, in <module>
    text_detection()
  File "C:Python27cvvidcheck.py", line 10, in text_detection
    img2gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
error: ......opencv-3.1.0modulesimgprocsrccolor.cpp:7456: error: (-215) scn == 3 || scn == 4 in function cv::ipp_cvtColor