Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - symfony/polyfill-mbstring is locked to version 1.x-dev and an update of this package was not requested. - symfony/polyfill-mbstring 1.x-dev requires ext-iconv * -> it is missing from your system. Install or enable PHP's iconv extension. Problem 2 - symfony/string is locked to version 7.3.x-dev and an update of this package was not requested. - symfony/polyfill-mbstring 1.x-dev requires ext-iconv * -> it is missing from your system. Install or enable PHP's iconv extension. - symfony/string 7.3.x-dev requires symfony/polyfill-mbstring ~1.0 -> satisfiable by symfony/polyfill-mbstring[1.x-dev]. To enable extensions, verify that they are enabled in your .ini files: - /home/runner/work/Snow/Snow/bin/php7/bin/php.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-iconv` to temporarily ignore these required extensions.