Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires flarum/core ^2.0.0, found flarum/core[dev-release/v1.6.2, dev-release/v1.6.3, dev-release/v1.7.2, dev-main-borked-with-split-conflicts, dev-main, dev-master, v0.1.0-beta, ..., v0.1.0-beta.16, v1.0.0, ..., 1.x-dev (alias of dev-master)] but it does not match the constraint. Problem 2 - Root composer.json requires flarum/testing ^2.0.0, found flarum/testing[dev-main, dev-master, dev-as/rollback-extension-migrations-before-tests, dev-as/include-current-extension, dev-as/start-transaction-before-boot, v0.1.0-beta.1, v0.1.0-beta.16, v0.1.0-beta.16.1, v1.0.0, ..., 1.x-dev (alias of dev-master)] but it does not match the constraint. Problem 3 - Root composer.json requires fof/split * -> satisfiable by fof/split[dev-master, 0.2, ..., 0.7.0, 1.0.0, 1.0.1, 1.1.0, 1.1.1]. - fof/split 0.2 requires flarum/core ^0.1.0-beta.6 -> found flarum/core[v0.1.0-beta.6, ..., v0.1.0-beta.16] but it conflicts with your root composer.json require (^2.0.0). - fof/split[0.3, ..., 0.4.4] require flarum/core ^0.1.0-beta.8 -> found flarum/core[v0.1.0-beta.8, ..., v0.1.0-beta.16] but it conflicts with your root composer.json require (^2.0.0). - fof/split 0.5.0 requires flarum/core >=0.1.0-beta.14 <0.1.0-beta.15 -> found flarum/core[v0.1.0-beta.14, v0.1.0-beta.14.1] but it conflicts with your root composer.json require (^2.0.0). - fof/split 0.5.1 requires flarum/core >=0.1.0-beta.14 <0.1.0-beta.16 -> found flarum/core[v0.1.0-beta.14, v0.1.0-beta.14.1, v0.1.0-beta.15] but it conflicts with your root composer.json require (^2.0.0). - fof/split 0.6.0 requires flarum/core ^0.1.0-beta.15 -> found flarum/core[v0.1.0-beta.15, v0.1.0-beta.16] but it conflicts with your root composer.json require (^2.0.0). - fof/split 0.7.0 requires flarum/core ^0.1.0-beta.16 -> found flarum/core[v0.1.0-beta.16] but it conflicts with your root composer.json require (^2.0.0). - fof/split[1.0.0, ..., 1.0.1] require flarum/core ^1.0.0 -> found flarum/core[dev-main, dev-master, v1.0.0, ..., 1.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^2.0.0). - fof/split[dev-master, 1.1.0, ..., 1.1.1] require flarum/core ^1.2.0 -> found flarum/core[dev-main, dev-master, v1.2.0, ..., 1.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^2.0.0).