New answers tagged blog-page
Technically you don't need to include a posts page on your site. Plenty of sites consist of just some pages and no posts at all. However, Google uses the posts pages to find links to your individual posts. If there is no such page you will need a different structure to guide Google (for instance through the menu, by including a dropdown of your child ...
Try to set the WP_DEBUG constant to true in wp-config.php file to get any errors shown in your browser. Also, you may want to check the network has been setup correctly - double check you have followed the steps here - http://codex.wordpress.org/Create_A_Network
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