Problems creating new blog template

I have a WordPress Multisite installation 3.6.1 with new sites as subdirectories (domain.com/site1, etc.). I started creating a site at the root (/), then created a new site at domain.com/newdeal. I then tried to create a new blog template from the new deal site by using the id 'newdeal' (no quotes) and get the following message: Whoops! The blog ID you posted is incorrect. You cannot template the main site. Please go back and try again. (Generated by New Blog Templates).

The main site is at the root and the newdeal site is under the newdeal subdirectory and shows as a separate site under the My Sites menu.

How can I create a template out of either the site at the root or the site under the /newdeal subdirectory?