Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in /home/esecureh/public_html/magdemo/vendor/magento/magento-composer-installer/src/MagentoHackathon/Composer/Magento/Installer.php:23 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/magento-composer-installer/src/MagentoHackathon/Composer/Magento/Installer.php on line 23