Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires acquia/acquia_cms * -> satisfiable by acquia/acquia_cms[dev-develop]. - acquia/acquia_cms dev-develop requires acquia/drupal-recommended-settings dev-ACMS-4480 -> found acquia/drupal-recommended-settings[dev-ACMS-4480] but it conflicts with your root composer.json require (^1.0).