Depending upon your robotic library configuration, the first slot could be numbered 1 or 0. If your robotic library uses a zero-based slot configuration you can reassign how the slots are displayed in Backup Exec, by right clicking the Robotic Library in the left pane, selecting Properties, and then selecting Configuration.

Depending on whether your robotic library begins slot numbering at 0 or 1, specify the appropriate number in the Slot Base option.

After completing the configuration of your robotic library, perform an Inventory operation to update the Backup Exec media database.