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i am unable to solve this plz help as soon as possible the cascade and the code is in the same file but i still get this error

hi everyone i am getting the same error what ever i do i even tried using the normal method(entering only the name) but still didnt work plz help as soon as possible, sorry for not arranged an an neat manner because i am using it first time and i dont know to use it properly

Traceback (most recent call last): File "/home/programmer/Desktop/project/face recg.py", line 11, in <module> faces = face_cascade.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5) cv2.error: OpenCV(3.4.5) /io/opencv/modules/objdetect/src/cascadedetect.cpp:1698: error: (-215:Assertion failed) !empty() in function 'detectMultiScale'

my code is given below for face recognizer

import numpy as np
import cv2

face_cascade = cv2.CascadeClassifier('/home/programmer/Desktop/project/cascades/data/cascades/data/haarcascade_fontalface_alt2.xml')

cap = cv2.VideoCapture(0)

while True:
    ret, frame = cap.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5)
    for(x, y, w, h) in faces:
        print(x,y,w,h)
    cv2.imshow('frame',frame)
    if cv2.waitKey(20) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

i am unable to solve this plz help as soon as possible the cascade and the code is in the same file but i still get this error

my code is given below for face recognizer

import numpy as np
import cv2

face_cascade = cv2.CascadeClassifier('/home/programmer/Desktop/project/cascades/data/cascades/data/haarcascade_fontalface_alt2.xml')

cap = cv2.VideoCapture(0)

while True:
    ret, frame = cap.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5)
    for(x, y, w, h) in faces:
        print(x,y,w,h)
    cv2.imshow('frame',frame)
    if cv2.waitKey(20) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()