Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires shopware/administration v6.6.6.0-rc2, found shopware/administration[dev-trunk, dev-6.0+ea, v6.0.0+ea2, ..., 6.6.x-dev (alias of dev-trunk)] but it does not match the constraint. Problem 2 - Root composer.json requires shopware/core v6.6.6.0-rc2, found shopware/core[dev-trunk, dev-6.0+ea, v6.0.0+ea2, ..., 6.6.x-dev (alias of dev-trunk)] but it does not match the constraint. Problem 3 - Root composer.json requires shopware/elasticsearch v6.6.6.0-rc2, found shopware/elasticsearch[dev-trunk, dev-6.0+ea, v6.0.0+ea2, ..., 6.6.x-dev (alias of dev-trunk)] but it does not match the constraint. Problem 4 - Root composer.json requires shopware/storefront v6.6.6.0-rc2, found shopware/storefront[dev-trunk, dev-6.0+ea, v6.0.0+ea2, ..., 6.6.x-dev (alias of dev-trunk)] but it does not match the constraint.

Process completed with exit code 2.