DVD File Set-up Error Message HELP

Hi – Very new here so please forgive me if i make a mistake and you need more information.

I am creating a dvd using ANVSOFT - A large one 4405 mb
When burning program - at very end (after HOURS of encoding) i get error message. It encodes the albums and menu fine and even the DVD folder…stops immediately before writing disc and give me this error:

DVD File Set-up Error

Burning dvd with both has worked before…at a slowere encoding speed.
My disc space is low but i clean it right before and it allows me to run the burn.

I am desparate to fix this today - I need to burn the master and make 125 copies by tomorrow…