DB2EUG: I/O error "2" on backup

[Villa Horacio]

Hi everybody,
I'm getting SQL2025N during a backup command to /dev/rmt0.
backup database digital tablespace (tbsp1, tbsp2) online to /dev/rmt0 
I position the tape with tapeutil and think it's correct. 
What is I/O error "2" or where can I find it?
TIA
Horacio Villa
TTI S.A.
Buenos Aires - Argentina

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