Fatal error: Uncaught Error: Class 'PHP_CodeSniffer\Files\File' not found in /var/www/html/simplesamlphp/vendor/squizlabs/php_codesniffer/src/Files/DummyFile.php:21
Stack trace:
#0 {main}
  thrown in /var/www/html/simplesamlphp/vendor/squizlabs/php_codesniffer/src/Files/DummyFile.php on line 21