Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires winter/wn-backend-module dev-develop, >=1.2.8, found winter/wn-backend-module[dev-wip/improve-grouped-repeater-styling, ..., dev-develop, v1.0.473, ..., 1.2.x-dev] but it does not match the constraint. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.