This forum is closed for new topics. However, you can still search for a solution in the old topics. For technical support related to the Nearby Posts premium extension please open a new premium support ticket.
It happens because you installed the previous version of the plugin, Nearby Posts 1.0.2. Please go to Your Account page, download Nearby Locations 1.1 beta 3 and install it on your site ( make sure to first uninstalled the version that you are currently using ). This version marked as beta but is safe to use on a productions site, I will officially release it this week.
Once you install Nearby Locations 1.1 beta 3 the shortcode [gmw_nearby_locations] will work as expected.