Your requirements could not be resolved to an installable set of packages. Problem 1 - alcaeus/mongo-php-adapter[1.2.0, ..., 1.x-dev] require ext-mongodb ^1.2.0 -> it is missing from your system. Install or enable PHP's mongodb extension. - commongateway/corebundle[1.1.90, ..., 1.2.48] require alcaeus/mongo-php-adapter ^1.2 -> satisfiable by alcaeus/mongo-php-adapter[1.2.0, ..., 1.x-dev]. - Root composer.json requires commongateway/corebundle ^1.1.90 -> satisfiable by commongateway/corebundle[1.1.90, ..., 1.2.48]. To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/conf.d/docker-php-ext-exif.ini - /usr/local/etc/php/conf.d/docker-php-ext-redis.ini - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini You can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode. Alternatively, you can run Composer with `--ignore-platform-req=ext-mongodb` to temporarily ignore these required extensions.