Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\error-handler\BufferingLogger.php:21 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\error-handler\BufferingLogger.php on line 21