Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /home/benjamincb/demos/acdg/vendor/symfony/runtime/Internal/ComposerPlugin.php:28 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg/vendor/symfony/runtime/Internal/ComposerPlugin.php on line 28