Your requirements could not be resolved to an installable set of packages. Problem 1 - rector/rector[1.2.0, ..., 1.2.10] require php ^7.2|^8.0 -> your php version (7.1.33) does not satisfy that requirement. - Root composer.json requires rector/rector ^1.2 -> satisfiable by rector/rector[1.2.0, ..., 1.2.10].