Warning: Unsupported declare 'strict_types' in /var/www/devel/md/product-db/vendor/league/config/src/ConfigurationBuilderInterface.php on line 3

Fatal error: Interface 'League\Config\MutableConfigurationInterface' not found in /var/www/devel/md/product-db/vendor/league/config/src/ConfigurationBuilderInterface.php on line 19