Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires silverstripe/admin ^3, found silverstripe/admin[dev-pulls/1.7/travis-shared, dev-pulls/1.7/037afdd, 1.0.0-alpha6, ..., 1.x-dev, 2.0.0-alpha1, ..., 2.x-dev] but it does not match the constraint. Problem 2 - Root composer.json requires silverstripe/framework ^6, found silverstripe/framework[dev-many-many-through-subclass, dev-revert-10291-pulls/4/revert, dev-pulls/fix-nbsp-test, 2.4.9, ..., 2.5.0, 3.0.2.1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev] but it does not match the constraint. Problem 3 - Root composer.json requires silverstripe/versioned ^3, found silverstripe/versioned[dev-pulls/1/sapphire-test-nine, 1.0.0-alpha6, ..., 1.x-dev, 2.0.0-alpha1, ..., 2.x-dev] but it does not match the constraint. Problem 4 - Root composer.json requires silverstripe/asset-admin ^3, found silverstripe/asset-admin[dev-1.12-release, dev-pulls/1.7/test-chromium-upgrade, dev-pulls/1.7/travis-shared, 1.0.0-alpha1, ..., 1.x-dev, 2.0.0-alpha1, ..., 2.x-dev] but it does not match the constraint. Problem 5 - Root composer.json requires silverstripe/cms ^6, found silverstripe/cms[dev-post-2.4, 2.4.9, ..., 2.5.x-dev (alias of dev-post-2.4), 3.0.2.1, ..., 3.x-dev, 4.0.0-alpha1, ..., 4.x-dev, 5.0.0-alpha1, ..., 5.x-dev] but it does not match the constraint. Problem 6 - silverstripe/recipe-cms 5.x-dev requires silverstripe/admin 2.x-dev -> found silverstripe/admin[2.x-dev] but it conflicts with your root composer.json require (^3). - silverstripe/installer 5.x-dev requires silverstripe/recipe-cms 5.x-dev -> satisfiable by silverstripe/recipe-cms[5.x-dev]. - Root composer.json requires silverstripe/installer 5.x-dev -> satisfiable by silverstripe/installer[5.x-dev].

Process completed with exit code 2.