update cascade path

app.py

@@ -6,7 +6,7 @@ from scipy.spatial import distance
 
 # Load model and haarcascade once
 model = load_model("masknet.h5")
-face_cascade = cv2.CascadeClassifier("haarcascade_frontalface_default.xml")
+face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')
 
 mask_label = {0: 'MASK', 1: 'NO MASK'}
 dist_label = {0: (0, 255, 0), 1: (255, 0, 0)}