Hello and welcome,
Sorry to hear that you cannot access your files. If you were using a RAID 1 setup, you should be able to recover your files by connecting one of the internal hard drives to a Linux PC, also check if one of the links below is useful.
http://community.wd.com/t5/My-Book-Live-Duo/Help-I-lost-my-data-in-MY-BOOK-LIVE-DUO-4TB/m-p/537542/highlight/true#M3574
http://community.wd.com/t5/My-Book-Live-Duo/GUIDE-Debrick-a-MyBookLive-DUO/m-p/544860/highlight/true#M3749