Marc,

        It probabaly means the device is either still busy for some reason
or someone power cycled the ATL and it is not properly talking to the ADSM
database now.  You might want to restart ADSM and or reboot your server
depending upon what state the library is in.  You may also want to recreate
your device as well if you have made any changes to the software and or
hardware.  I have had the same issues as well. Thanks

Matt