Your requirements could not be resolved to an installable set of packages. Problem 1 - sulu/sulu[2.6.3, ..., 2.6.x-dev] require symfony/config ^5.4 || ^6.0 -> found symfony/config[v5.4.0, ..., v5.4.40, v6.0.0, ..., v6.4.8] but it conflicts with your root composer.json require (^7.1). - Root composer.json requires sulu/sulu ~2.6.3@dev -> satisfiable by sulu/sulu[2.6.3, 2.6.x-dev].