Failed to Exclusively Access Backup

I received the following error message: "Failed to exclusively access backup
\\DLINK-4AAB55\Volume_2\Memories|Acer_Desktop_3_full_b25_s1_v1.tib during consolidation. Make sure the backup file is not opened in another application."

My D-Link 4AAB55 NAS went bad and I removed it from my LAN. I then created a new backup on another NAS on my LAN. The error message occurs when the new backup runs. The backup file for Acer Desktop 3 is on the same volume in the new NAS as the new backup I created.

True Image will create a full backup, five differential backups, a full backup, five differential backups and another full backup, all on the same day, after the above error message.

How can I get True Image 2015 to know that the D-Link NAS is no longer used and the Memories backup is not valid? How an I get it to just create the new backup with the differential scheme I intend; full backup then five differential backups on consecutive days, then another full backup and five differentials, etc?

I couldn't find how to include the Acronis Build Number, but I have the latest version of True Image 2015.

Thanks for your help.