An unhandled error occured

Security exception - invalid and potentially unsafe Request URI detected

Stack trace
#0 /home/augustmuzeum/ftp/www2/sitemagic/base/SMController.class.php(79): SMController->securityValidation()
#1 /home/augustmuzeum/ftp/www2/sitemagic/index.php(26): SMController->__construct()
#2 {main}