amflush won't work, amstatus 0% ( missing info )

[Francesc Guasch]

I can't flush data and amstatus reports 0% data.

I forgot to say this is:

redhat-release-8.0-8
amanda-2.4.3-2 ( built by myself )
The tape is: Vendor: HP     Model: C1537A
              tapetype HP-DAT3