VSSADMIN errors during backup

I have Win XP Pro SP3 on a Dell Optiplex 755 Dektop with 4GB RAM.

Last November, using Aomei Backupper Pro 2, I did a FULL backup (Disk Backup.adi - 85GB).

Yesterday (May 2), using Aomei Backupper Pro 2.5 (new version), I did my first INCREMENTAL backup (Disk Backup1.adi - 33GB).

HOWEVER, Event Viewer says there were two VSSADMIN errors during yesterday's INCREMENTAL backup.  So maybe it's no good.

QUESTION:  Is it possible to discard yesterday's INCREMENTAL backup and re-do it?  So that Aomei Backupper Pro 2.5 thinks there is only the original FULL backup and NO faulty incremental backup?  IMPORTANT: If I try to restore later, the discarded INCREMENTAL backup will not be there.  Do you understand my question?

Thanks.