Download and install this software on your PC. There is a Mac version also. Use the software to connect to your MBL, rather than the wd2go web interface.
http://support.wd.com/product/download.asp?groupid=904&sid=209&lang=en
by the way, your error problem is related to java. Your browser is probably not enabling java for this particular webpage. In any case, use the software and your don’t need to worry about this problem
