Setono / SyliusLogEntryPlugin

src/DependencyInjection/Configuration.php

<?php

declare(strict_types=1);

namespace Setono\SyliusLogEntryPlugin\DependencyInjection;

use Sylius\Bundle\ResourceBundle\SyliusResourceBundle;
use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

final class Configuration implements ConfigurationInterface
{
    public function getConfigTreeBuilder(): TreeBuilder
    {
        $treeBuilder = new TreeBuilder('setono_sylius_log_entry');
        $rootNode = $treeBuilder->getRootNode();

        $rootNode
            ->addDefaultsIfNotSet()

The method addDefaultsIfNotSet() does not exist on Symfony\Component\Config\Definition\Builder\NodeDefinition. It seems like you code against a sub-type of Symfony\Component\Config\Definition\Builder\NodeDefinition such as Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition.

            ->children()
                ->scalarNode('driver')->defaultValue(SyliusResourceBundle::DRIVER_DOCTRINE_ORM)->end()
            ->end()
        ;

        return $treeBuilder;
    }
}