Fatal error: Uncaught Error: Using $this when not in object context in D:\xampp\htdocs\_runing\sales-manager-system\vendor\symfony\error-handler\Resources\views\traces.html.php:5 Stack trace: #0 {main} thrown in D:\xampp\htdocs\_runing\sales-manager-system\vendor\symfony\error-handler\Resources\views\traces.html.php on line 5