Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires simplesamlphp/xml-soap ~1.5.5 -> satisfiable by simplesamlphp/xml-soap[v1.5.5]. - simplesamlphp/xml-soap v1.5.5 requires simplesamlphp/xml-common ~1.20.0 -> found simplesamlphp/xml-common[v1.20.0, v1.20.1] but it conflicts with your root composer.json require (~1.22.0).

Process completed with exit code 2.