Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\attendance_app\send_notificationToUser_daduyet.php on line 21

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\attendance_app\send_notificationToUser_daduyet.php on line 22

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\attendance_app\send_notificationToUser_daduyet.php on line 23

Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\attendance_app\send_notificationToUser_daduyet.php on line 24
{"error":"Manager kh\u00f4ng t\u1ed3n t\u1ea1i ho\u1eb7c ch\u01b0a c\u00f3 FCM token"}