Fatal error: Uncaught Error: Using $this when not in object context in D:\xampp\htdocs\app_patient_test\vendor\symfony\error-handler\Resources\views\traces.html.php:6 Stack trace: #0 {main} thrown in D:\xampp\htdocs\app_patient_test\vendor\symfony\error-handler\Resources\views\traces.html.php on line 6