View source for A TAPE ERROR OCCURRED: Could not find a tape to use

{{Troubleshooting Header}}
= Problem =
In my case problem was in that amtape was unable to change tape.

The symptom is:
 # amtape home-backup show
 slot   1: time 20080916051516 label backup-01
 slot   2: time 20080917041356 label backup-02
 slot   2: time 20080917041356 label backup-02
 slot   2: time 20080917041356 label backup-02
 slot   2: time 20080917041356 label backup-02
 ....

amcheck was repeating tapes/slots too.

The worst thing is that amanda doesn't report any useful error if tape changer (chg-multi in my case) can't load a slot
( amtape home-backup slot 3 doesn't raise any alert in spite of error )
= Solution =
So, in my case I just corrected permissions in changer state-file parent directory
(! First look at where your state-file resides, /var/amanda/changer-state may be specific to my setup)
 # chown amandabackup /var/amanda