Your requirements could not be resolved to an installable set of packages.
Problem 1
- silverstripe/recipe-cms 4.12.x-dev requires silverstripe/admin 1.12.x-dev -> found silverstripe/admin[1.12.x-dev] but it conflicts with your root composer.json require (^1.13@dev).
- silverstripe/installer 4.12.x-dev requires silverstripe/recipe-cms 4.12.x-dev -> satisfiable by silverstripe/recipe-cms[4.12.x-dev].
- Root composer.json requires silverstripe/installer 4.12.x-dev -> satisfiable by silverstripe/installer[4.12.x-dev].