More information needed for someone to help... please click below and provide the requested information
-Information FAQ http://forums.adobe.com/message/4200840
As a workaround, Create an output ISO file (Encore) or set your output to a folder on your hard drive and then use the FREE http://www.imgburn.com/index.php?act=download to write files or folders or ISO to disc for DVD or BluRay (send the author a PayPal donation if you like his program)
Note that I always create an ISO instead of going direct to drive for a DVD... I don't do BluRay, so you may have to experiment
If the above process works, read the next section about WHY you may have a failing process
Things and Software to AVOID when authoring/burning a disc
Start --> http://forums.adobe.com/thread/608660
#2 has WHY Explained http://forums.adobe.com/thread/607390
Make sure your burner has the latest firmware version.
Or try a different brand or package.
Along with other questions, what brand of blank media are you using?