Hello Stefan,
Both of your jobs (BackupCatalog and Backup job AB01) are trying to use device FileStorage. Is this your only device? If so, you can have concurrent jobs writing in the same mounted volume in this device. You cannot have more than one volume mounted in one specific drive. Also, you no not have "Label Format" configured for your pools. This way bacula will not be able to automatic label your volumes. You will need to do this manually.
You mentioned about using VTLs, can you post the output for "lsscsi -g"?
Best regards,
Ana