Backup with Veritas 8.0

I’m having the worst time getting a backup. At one time things ran smoothly every night, once Veritas 8.0 was installed, I get an alert stating:
“Please insert overwritable media”….

“Overwritable media….”
I have gone through the steps thatVeritas suggests for this exact alert, to no avail. Any suggests and help IS, as always, greatly appreciated.

Thank you, vida