@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Sonata Project package.
+ *
+ * (c) Thomas Rabaix <thomas.rabaix@sonata-project.org>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+/*
+ * This file will be loaded when SonataAdminBundle is enabled and db_driver has its default value,
+ * not corresponding to real persistence mechanism.
+ */
Did you try this change? I never saw a services file in php without the return static function.