Fatal error: Uncaught Error: Class 'Composer\Installer\LibraryInstaller' not found in /mnt/www/law_firm/personnel/vendor/yiisoft/yii2-composer/Installer.php:21 Stack trace: #0 {main} thrown in /mnt/www/law_firm/personnel/vendor/yiisoft/yii2-composer/Installer.php on line 21