The error is: "Photoshop.com services are currently unavailable. Please try again later or check your network connections. Error 400."
Alternatively, you can bypass the Welcome screen by opening the application files directly.
Elements 10, 9, 8, and 7 Organizer include a Backup/Synchronization feature. It automatically uploads and downloads the images in your catalog to and from Photoshop.com's Sharing and Storage servers.
On July 15 2013, these Sharing and Storage servers were shut down and the services Photoshop.com provided were discontinued.
For more information about this change, see http://www.photoshop.com/misc/membership-faq