Fatal error: Uncaught RuntimeException: Source class "\Monolog" for "Monolog\Logger" generation does not exist. in /home/koala/public_html/vendor/magento/framework/Code/Generator.php:218 Stack trace: #0 /home/koala/public_html/vendor/magento/framework/Code/Generator.php(124): Magento\Framework\Code\Generator->tryToLoadSourceClass('Monolog\\Logger', Object(Magento\Framework\ObjectManager\Profiler\Code\Generator\Logger)) #1 /home/koala/public_html/vendor/magento/framework/Code/Generator/Autoloader.php(35): Magento\Framework\Code\Generator->generateClass('Monolog\\Logger') #2 [internal function]: Magento\Framework\Code\Generator\Autoloader->load('Monolog\\Logger') #3 /home/koala/public_html/vendor/magento/framework/Logger/Monolog.php(11): spl_autoload_call('Monolog\\Logger') #4 /home/koala/public_html/vendor/composer/ClassLoader.php(444): include('/home/koala/pub...') #5 /home/koala/public_html/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/home/koala/pub...') #6 [internal function]: Composer\Autoload\ in /home/koala/public_html/vendor/magento/framework/Code/Generator.php on line 218