Backup completed with errors(101)

[bbmacusa]

This is my backup log from this week:
Backup Exec Job: Daily 0 Started 10/23/2001 at 4:00 AM
Backup Exec Job: Daily 0 Finished 10/23/2001 at 6:16 AM
| Result: Backup completed with errors(101)
Backup Exec Job: Daily 0 Started 10/24/2001 at 4:00 AM
Backup Exec Job: Daily 0 Finished 10/24/2001 at 6:31 AM
| Result: Backup completed with errors(101)
Backup Exec Job: Tu - W - Th - Fr - Sat 0 Started 10/25/2001 at 1:00 AM
Backup Exec Job: Tu - W - Th - Fr - Sat 0 Finished 10/25/2001 at 3:42 AM
| Result: Backup completed with errors(101)

My question - what does error 101 mean?

Thanks