Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires shish/safe ^2.0 -> satisfiable by shish/safe[v2.6.0, v2.6.1, v2.6.2]. - shish/safe[v2.6.0, ..., v2.6.2] require ext-intl * -> it is missing from your system. Install or enable PHP's intl extension. To enable extensions, verify that they are enabled in your .ini files: - /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-intl` to temporarily ignore these required extensions.