Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /home/soh-works/www/3good_old/vendor/ocramius/package-versions/src/PackageVersions/Installer.php:32 Stack trace: #0 {main} thrown in /home/soh-works/www/3good_old/vendor/ocramius/package-versions/src/PackageVersions/Installer.php on line 32