Fatal error: Uncaught Error: Interface 'Contao\CoreBundle\Search\Indexer\IndexerInterface' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Search/Indexer/DefaultIndexer.php:20 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Search/Indexer/DefaultIndexer.php on line 20