Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php >=7.2 || ^8.0 but your php version (7.1.33) does not satisfy that requirement. Problem 2 - Root composer.json requires psr/http-message ^2.0 -> satisfiable by psr/http-message[2.0]. - psr/http-message 2.0 requires php ^7.2 || ^8.0 -> your php version (7.1.33) does not satisfy that requirement.