Fatal error: Uncaught Symfony\Component\Config\Definition\Exception\InvalidConfigurationException: The child node "default_contexts" at path "sonata_block" must be configured. in /app/vendor/symfony/symfony/src/Symfony/Component/Config/Definition/ArrayNode.php:224 Stack trace: #0 /app/vendor/symfony/symfony/src/Symfony/Component/Config/Definition/BaseNode.php(328): Symfony\Component\Config\Definition\ArrayNode->finalizeValue(Array) #1 /app/vendor/symfony/symfony/src/Symfony/Component/Config/Definition/Processor.php(37): Symfony\Component\Config\Definition\BaseNode->finalize(Array) #2 /app/vendor/symfony/symfony/src/Symfony/Component/Config/Definition/Processor.php(50): Symfony\Component\Config\Definition\Processor->process(Object(Symfony\Component\Config\Definition\ArrayNode), Array) #3 /app/vendor/sonata-project/block-bundle/DependencyInjection/SonataBlockExtension.php(57): Symfony\Component\Config\Definition\Processor->processConfiguration(Object(Sonata\BlockBundle\DependencyInjection\Configuration), Array) #4 /app/vend in /app/vendor/symfony/symfony/src/Symfony/Component/Config/Definition/ArrayNode.php on line 224