Fatal error: Uncaught Error: Interface 'Composer\Plugin\PluginInterface' not found in /var/www/html/simplesamlphp/vendor/dealerdirect/phpcodesniffer-composer-installer/src/Plugin.php:35
Stack trace:
#0 {main}
  thrown in /var/www/html/simplesamlphp/vendor/dealerdirect/phpcodesniffer-composer-installer/src/Plugin.php on line 35