Your requirements could not be resolved to an installable set of packages. Problem 1 - sylius/mailer-bundle[v2.0.0-BETA.1, ..., v2.0.0] require symfony/config ^5.4 || ^6.0 -> found symfony/config[v5.4.0, ..., v5.4.26, v6.0.0, ..., v6.3.2] but these were not loaded, likely because it conflicts with another require. - sylius/mailer-bundle[v1.8.0-BETA.1, ..., v1.8.1] require symfony/config ^5.4 -> found symfony/config[v5.4.0, ..., v5.4.26] but these were not loaded, likely because it conflicts with another require. - Root composer.json requires sylius/mailer-bundle ^1.8 || ^2.0@beta -> satisfiable by sylius/mailer-bundle[v1.8.0-BETA.1, v1.8.0, v1.8.1, v2.0.0-BETA.1, v2.0.0].