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image = cv2.imread('yüz1.jpg')
cv2.imread('yüz1.jpg')
  
faceCascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
  
greyImage = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)
  
faces = faceCascade.detectMultiScale(image,1.1,4)faceCascade.detectMultiScale(image,1.1,4)
  
for(x,y,w,h) in faces :
    cv2.rectangle(image, (x,y), (x+w,y+h),(0,255,0),3)(x+w,y+h),(0,255,0),3)
  
cv2.imshow('faces', image)
cv2.waitKey(0)
cv2.destroyAllWindows()cv2.destroyAllWindows()
  
"C:\Users\asus\Documents\Python Çalışma\venv\Scripts\python.exe" "C:/Users/asus/Documents/Python Çalışma/İmageProcessing/faceDetection.py"
Traceback (most recent call last):
  File "C:/Users/asus/Documents/Python Çalışma/İmageProcessing/faceDetection.py", line 8, in <module>
    greyImage = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)
cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor''cv::cvtColor'

import cv2
 import numpy as np
np
  
image = cv2.imread('yüz1.jpg')

faceCascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

greyImage = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)

faces = faceCascade.detectMultiScale(image,1.1,4)

for(x,y,w,h) in faces :
    cv2.rectangle(image, (x,y), (x+w,y+h),(0,255,0),3)

cv2.imshow('faces', image)
cv2.waitKey(0)
cv2.destroyAllWindows()


"C:\Users\asus\Documents\Python Çalışma\venv\Scripts\python.exe" "C:/Users/asus/Documents/Python Çalışma/İmageProcessing/faceDetection.py"
Traceback (most recent call last):
  File "C:/Users/asus/Documents/Python Çalışma/İmageProcessing/faceDetection.py", line 8, in <module>
    greyImage = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)
cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'
  
The Result : 
 
Check image path
 
But image and code is the same path then it is writing continuous 'Check image path' when I run the code