Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in C:\xampp\htdocs\adminlte3\vendor\symfony\error-handler\BufferingLogger 3.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\adminlte3\vendor\symfony\error-handler\BufferingLogger 3.php on line 21