Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires PHP extension ext-krb5 * but it is missing from your system. Install or enable PHP's krb5 extension. To enable extensions, verify that they are enabled in your .ini files: - C:\tools\php\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-krb5` to temporarily ignore these required extensions.