Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires drupal/acquia_cms_starter dev-develop -> satisfiable by drupal/acquia_cms_starter[dev-develop]. - drupal/acquia_cms_starter dev-develop requires drupal/acquia_cms_search ^1.4.13 -> satisfiable by drupal/acquia_cms_search[dev-1.x, dev-1.4.x, 1.4.13, ..., 1.x-dev (alias of dev-1.x)] from composer repo (https://packages.drupal.org/8) but drupal/acquia_cms_search[dev-develop] from path repo (./modules/acquia_cms_search) has higher repository priority. The packages from the higher priority repository do not match your constraint and are therefore not installable. That repository is canonical so the lower priority repo's packages are not installable. See https://getcomposer.org/repoprio for details and assistance. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

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