You have 1 drive, 7 data tapes and one cleaning tape. looks like a tape 004 may be stuck somewhere.
Hello [NAME]  [NAME] [NAME] [NAME] [NAME]  I Have Dell TL1000 Tape Library with 8-Drives , when I connected the Library to Management server  starts Inventory . but now 1-Drive is Stucked in head of Library when I'm trying to Unload its getting failed saying ( Operation execution  error detected)   & All the Drives showing offline in Acronis Management server. posting the screenshot below. [IMAGE]  
Dell TL1000 all the tapes showing offline in Acronis Management Server