Just installed this new unit with 16 tapes. In CA ARCSERV 11.1, in Devices, it shows the 16 slots with tapes. I put them in groups Monday, Tuesday, Wednesday, Thursday and Month 7 with 3 tapes each. When I go to do a backup it gives me the message "unable to find any media that can be used in this job: Error W3831. I used the Device Configuration Wizard to configure them as a tape/optical backup. I must be missing one step. Any suggestions please. TIA