Fatal error: Uncaught Error: Class "Monolog\Handler\StreamHandler" not found in C:\xampp\htdocs\cms-propay\vendor\google\cloud-core\src\Logger\AppEngineFlexHandler.php:30 Stack trace: #0 {main} thrown in C:\xampp\htdocs\cms-propay\vendor\google\cloud-core\src\Logger\AppEngineFlexHandler.php on line 30