Everything went as expected, you should have some content on your blog.
You would think the developer would supress warnings (or better yet fix them :)
But no, this seems to happen all the time when content is gathered. Some foreach loop is probably being provided with a string when it expects an array. And the sleep function has no parameter (remember, we never provided one). This can be fixed by slapping a if statement ahead of the sleep function, something along the lines of if ($_GET['sleep'] != "") sleep($_GET['sleep']);
But I diverge ...