Crawls your website-pages based on google XML sitemap. If you have a caching plugin this will keep your cache warm. Speeds up your site.
Ask your webhost how to set up a get call using wget or curl
If you have object caching such as W3 total cache, the statistics cannot be read.
A help topic about this is placed on the support forums. Note that the script is crawling your XML file (check your webhosts access log), but you cannot see the statistics.
The support forums over here, drop me a tweet to notify me of your support topic over here.
I always check my tweets, so mention my name with @ramonfincken and your problem.