Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /home/benjamincb/demos/acdg-site/vendor/contao/manager-plugin/src/Composer/ManagerPluginInstaller.php:29 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/manager-plugin/src/Composer/ManagerPluginInstaller.php on line 29