Fatal error: Uncaught Error: Class "Monolog\Handler\StreamHandler" not found in /var/www/html/firePhpSdk/vendor/google/cloud-core/src/Logger/AppEngineFlexHandler.php:28 Stack trace: #0 {main} thrown in /var/www/html/firePhpSdk/vendor/google/cloud-core/src/Logger/AppEngineFlexHandler.php on line 28