Fatal error: Uncaught Error: Interface 'Psr\SimpleCache\CacheInterface' not found in /var/www/alldocs/home/cmckay/cms_static/simplesamlphp_sp/vendor/symfony/cache/Simple/NullCache.php:23 Stack trace: #0 {main} thrown in /var/www/alldocs/home/cmckay/cms_static/simplesamlphp_sp/vendor/symfony/cache/Simple/NullCache.php on line 23