Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires smile/module-store-locator 2.0.x-dev -> satisfiable by smile/module-store-locator[2.0.x-dev]. - smile/module-store-locator 2.0.x-dev requires smile/module-retailer ~1.2.0 -> found smile/module-retailer[1.2.0-alpha1, ..., 1.2.x-dev] but it conflicts with your root composer.json require (2.0.x-dev).