Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires nextcloud/ocp dev-stable26 -> satisfiable by nextcloud/ocp[dev-stable26]. - nextcloud/ocp dev-stable26 requires psr/container ^1.1.1 -> found psr/container[1.1.1, 1.1.2] 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.