Fatal error: Uncaught TypeError: fputcsv(): Argument #1 ($stream) must be of type resource, false given in /users_2024_ade/ma13060/public_html/ML/Classification/knn_test.php:63 Stack trace: #0 /users_2024_ade/ma13060/public_html/ML/Classification/knn_test.php(63): fputcsv(false, Array) #1 {main} thrown in /users_2024_ade/ma13060/public_html/ML/Classification/knn_test.php on line 63