Need Help.... ERROR WRITING TO FILE: (0X4003)

I start up a new Full back up of files and folders to a DVD … When the backup commences I get this error message from numerous files Acronis is attempting to backup…

ERROR WRITING TO FILE: (0X4003) ( The file or folders location)

Tag = 0x15602567d340ab0a

The DVD media I’m using has been working for other burns and working really well…
For this particular backup that failed, I had to backup manually using Nero… The DVD burned nicely… I’m stumped… What can I do to correct the problem What is Acronis finding wrong??