Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires academy/php-unit * -> satisfiable by academy/php-unit[1.0.0]. - academy/php-unit 1.0.0 requires shopware/core ~6.6.0 -> found shopware/core[v6.6.0.0, ..., v6.6.9.0] but these were not loaded, likely because it conflicts with another require.