Buffer Under Flow Error
 

Not sure I am in the right forum but if not sorry. I'm burning a 59 minute Bluray in DVDA Pro 6 and during the rendering before the burn I'm getting a buffer underflow error at 50% rendered. I rendered the video in Vegas pro 12 using
Blu-ray 1920x1080-24p, 25mbps video stream Main Concept. this is only the 3rd video I have produced. I did a smaller vid and a clip for you tube. I have searched these forums but cannot find anything on video buffer underflow. I have found a little on the web but nothing I have found has worked. If I had hair I would be pulling it out.any help will be appreciated.
Chris