no hardware info is available for drive x - device is not in service

 Hi everybody,I'm new in Oracle secure Backup.
I have configured osb; one Lib with 2 Tape.. and oracle backup with rman.
I don't know why the backup are pending and in device have this error:

ob> lsdev -lg
cLib1:
    Device type:            library
    Model:                  [none]
    Serial number:          00X4U78P2318_LL0
    In service:             yes
    Debug mode:             no
    Barcode reader:         yes
    Barcodes required:      yes
    Auto clean:             no
    Clean interval:         (not set)
    Clean using emptiest:   no
    Unload required:        yes
    Ejection type:          auto
    Min writable volumes:   0
    UUID:                   135995b6-af87-102e-8e55-14feb5d265f9
    Attachment 1:
        Host:               cgtccmgmt.cc.local
        Raw device:         /dev/sg2