Your requirements could not be resolved to an installable set of packages. Problem 1 - silverstripe/recipe-testing[3.0.0, ..., 3.x-dev] require silverstripe/framework ^5 -> satisfiable by silverstripe/framework[5.0.0-alpha1, ..., 5.x-dev]. - silverstripe/recipe-testing[2.0.0, ..., 2.x-dev] require silverstripe/framework ^4.10 -> satisfiable by silverstripe/framework[4.10.0-beta1, ..., 4.x-dev]. - You can only install one version of a package, so only one of these can be installed: silverstripe/framework[3.5.0-rc1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev, 6.x-dev]. - silverstripe/cms 6.x-dev requires silverstripe/framework ^6 -> satisfiable by silverstripe/framework[6.x-dev]. - Root composer.json requires silverstripe/cms ^6 -> satisfiable by silverstripe/cms[6.x-dev]. - Root composer.json requires silverstripe/recipe-testing ^2 || ^3 -> satisfiable by silverstripe/recipe-testing[2.0.0, 2.0.x-dev, 2.x-dev, 3.0.0, 3.0.x-dev, 3.x-dev].

Process completed with exit code 2.