Are you able to give more info:
What part of process - the burn or the validation
Is it with same set of data - may indicate possible problem on hd, scan the hd to check.
If in validation could point to problem with data copy, bad CD/DVD. If happens on others from same batch of CD/DVD try different brand - I had problem with set of cheapish unbranded blank disks - worked fine when I changed to othet set.