Actualización

vendor/sonata-project/block-bundle/src/Resources/stubs/symfony2.php

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+<?php
+
+/*
+ * 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.
+ */
+
+namespace Symfony\Component\OptionsResolver;
+
+if (!interface_exists('Symfony\Component\OptionsResolver\OptionsResolverInterface')) {
+    /**
+     * @deprecated since 3.9, to be removed in 4.0. Use \Symfony\Component\OptionsResolver\OptionsResolver instead.
+     */
+    interface OptionsResolverInterface
+    {
+    }
+}