No idea why the script gets this error code

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Hello everybody,

I've written a script for detection of edges, but the problem is that my script get an error which i have added in the following. Whenever i want to run the script the shell appears for 1-2 seconds and after that it closes itself. I have no idea what it could be, i hope someone have an idea which would help me. The script is this here and the error code ist also in the following :

Script :

import cv2
import numpy as np

cap = cv2.VideoCapture(0)

while(1):

    _, frame = cap.read()
    hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

    lower_red = np.array([30,150,50])
    upper_red = np.array([255,255,180])

    mask = cv2.inRange(hsv, lower_red, upper_red)
    res = cv2.bitwise_and(frame,frame, mask= mask)

    cv2.imshow('Original',frame)
    edges = cv2.Canny(frame,100,200)
    cv2.imshow('Edges',edges)

    k = cv2.waitKey(5) & 0xFF
    if k == 27:
        break

cv2.destroyAllWindows()
cap.release()

The Error Code:

hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
cv2.error: C:\build\2_4_winpack-bindings-win64-vc14-static\opencv\modules\imgproc\src\color.cpp:3961: error: (-215) (scn == 3 || scn == 4) && (depth == CV_8U || depth == CV_32F) in function cv::cvtColor