Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires drupal/core 10.2.7 -> satisfiable by drupal/core[10.2.7]. - drupal/core 10.2.7 conflicts with drush/drush 11.6.0. - Root composer.json requires drush/drush 11.6.0 -> satisfiable by drush/drush[11.6.0].