Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nextcloud/ocp dev-stable27 -> satisfiable by nextcloud/ocp[dev-stable27]. - nextcloud/ocp dev-stable27 requires psr/container ^2.0.2 -> found psr/container[2.0.2] but these were not loaded, likely because it conflicts with another require. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.