Going to the page https://derivative.ca/UserGuide/Hold_CHOP as well as other pages from the user guide sends this error:
*RedisException* : MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error. in *Redis->hSet()* (line *39* of */var/www/drupal/sites/all/modules/contrib/redis/lib/Redis/Path/PhpRedis.php* ).
