Hello Sergio
Probably you have some error in the volume.
You can try BLS and BEXTRACT to try to restore some data from the volume.
In the shell command line:
Syntax
bls -c /etc/bacula/bacula-sd.conf -V Volume-0001 /path/for/storage
bextract -c /etc/bacula/bacula-sd.conf -V Volume-0001 /path/for/storage /path/for/restore