Root composer.json requires nucleos/user-admin-bundle 1.5.x-dev -> satisfiable by nucleos/user-admin-bundle[1.5.x-dev].
nucleos/user-admin-bundle 1.5.x-dev requires sonata-project/admin-bundle ^3.90 -> found sonata-project/admin-bundle[3.90.0, ..., 3.x-dev] but it conflicts with your root composer.json require (dev-master).
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Problem 1