Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires pimcore/generic-data-index-bundle @dev -> satisfiable by pimcore/generic-data-index-bundle[2.x-dev]. - pimcore/generic-data-index-bundle 2.x-dev requires pimcore/pimcore ^12.x-dev -> found pimcore/pimcore[12.x-dev] but it conflicts with your root composer.json require (11.x-dev as 11.99.9).