Physical Volume Library Drive not available.

Hi

I'm having a problem with symantec Backup Exec.
I want to take a backup from my server on a NAS. This backup worked in the past, but suddenly it stopped working

I always get the error:
Error category    : Backup Device ErrorsError             : e000810c - Physical Volume Library Drive not available.

My devices are offline. When i change them to online, there's no problem but once i launch the backup they change to offline.

What can i do about this?

thanks in advance

201408-LO-Qu-011

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