Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires platine-php/filesystem ^1.0 -> satisfiable by platine-php/filesystem[v1.0.0]. - platine-php/filesystem v1.0.0 requires platine-php/stdlib 1.0.x-dev -> found platine-php/stdlib[dev-develop, v1.0.0] but it does not match the constraint.