Fatal error: Uncaught Error: Interface 'Psr\Cache\CacheException' not found in /var/www/alldocs/home/rprather/TIWebsite/simplesamlphp_idp/vendor/psr/cache/src/InvalidArgumentException.php:11 Stack trace: #0 {main} thrown in /var/www/alldocs/home/rprather/TIWebsite/simplesamlphp_idp/vendor/psr/cache/src/InvalidArgumentException.php on line 11