Fatal error: Uncaught Error: Using $this when not in object context in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\error-handler\Resources\assets\images\symfony-ghost.svg.php:1 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\error-handler\Resources\assets\images\symfony-ghost.svg.php on line 1