Your requirements could not be resolved to an installable set of packages. Problem 1 - silverstripe/assets[1.10.0-beta1, ..., 1.x-dev] require silverstripe/framework ^4.10 -> satisfiable by silverstripe/framework[4.10.0-beta1, ..., 4.x-dev] from composer repo (https://repo.packagist.org) but silverstripe/framework is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/assets[1.0.0-alpha6, ..., 1.1.0] require silverstripe/framework ^4@dev -> satisfiable by silverstripe/framework[4.0.0-alpha1, ..., 4.x-dev] from composer repo (https://repo.packagist.org) but silverstripe/framework is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/assets[1.1.1, ..., 1.5.0] require silverstripe/framework ^4.1 -> satisfiable by silverstripe/framework[4.1.0-rc1, ..., 4.x-dev] from composer repo (https://repo.packagist.org) but silverstripe/framework is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/assets[1.5.1, ..., 1.9.x-dev] require silverstripe/framework ^4.5 -> satisfiable by silverstripe/framework[4.5.0-alpha1, ..., 4.x-dev] from composer repo (https://repo.packagist.org) but silverstripe/framework is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - silverstripe/assets 1.13.0-beta1 requires silverstripe/framework 4.13.0-beta1 -> satisfiable by silverstripe/framework[4.13.0-beta1] from composer repo (https://repo.packagist.org) but silverstripe/framework is the root package and cannot be modified. See https://getcomposer.org/dep-on-root for details and assistance. - Root composer.json requires silverstripe/assets ^1@dev -> satisfiable by silverstripe/assets[1.0.0-alpha6, ..., 1.x-dev].