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[dev-5cf9eee21832a21ddbf3fa09b6782ff8dbcd007e]. - pimcore/generic-data-index-bundle dev-5cf9eee21832a21ddbf3fa09b6782ff8dbcd007e requires nesbot/carbon ^3.8.4 -> satisfiable by nesbot/carbon[3.8.4, 3.x-dev]. - pimcore/generic-data-index-bundle dev-5cf9eee21832a21ddbf3fa09b6782ff8dbcd007e requires pimcore/pimcore ^12.0 -> satisfiable by pimcore/pimcore[12.x-dev]. - pimcore/pimcore 12.x-dev requires nesbot/carbon ^2.72 -> satisfiable by nesbot/carbon[2.72.0, ..., 2.x-dev]. - You can only install one version of a package, so only one of these can be installed: nesbot/carbon[2.27.0, ..., 2.x-dev, 3.8.4, 3.x-dev].