Backup process failed with code... 97

Im my case, Comodo Backup 2 failed with code 97 on the last, sixth step.

I choose to backup “Disk, Partitions and MBR” with medium compression, with AES encription, to local disk on USB (WD).

Sometimes error is:

Sometimes that way:

Thanks for help.

Sorry all! Did not perfor restart after install. After restart Backup works perfectly.