Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires league/flysystem-bundle ^2.3 -> satisfiable by league/flysystem-bundle[2.3.0, 2.4.0]. - league/flysystem-bundle[2.3.0, ..., 2.4.0] require symfony/config ^4.2|^5.0|^6.0 -> found symfony/config[v4.2.0, ..., v4.4.44, v5.0.0, ..., v5.4.31, v6.0.0, ..., v6.4.0] but these were not loaded, likely because it conflicts with another require. Problem 2 - Root composer.json requires matthiasnoback/symfony-dependency-injection-test ^4.3 -> satisfiable by matthiasnoback/symfony-dependency-injection-test[4.3.0, v4.3.1]. - matthiasnoback/symfony-dependency-injection-test[4.3.0, ..., v4.3.1] require symfony/dependency-injection ^4.4 || ^5.3 || ^6.0 -> found symfony/dependency-injection[v4.4.0, ..., v4.4.49, v5.3.0, ..., v5.4.33, v6.0.0, ..., v6.4.1] but these were not loaded, likely because it conflicts with another require.