Your requirements could not be resolved to an installable set of packages. Problem 1 - 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. Problem 2 - psr/http-message 2.0 requires php ^7.2 || ^8.0 -> your php version (7.1.33) does not satisfy that requirement. - psr/http-factory 1.1.0 requires psr/http-message ^1.0 || ^2.0 -> satisfiable by psr/http-message[2.0]. - Root composer.json requires psr/http-factory ^1.1 -> satisfiable by psr/http-factory[1.1.0].