Error status on existing domain - Backup Related

[Pragma]

I am getting the following error on one of my domains:

Code:

sys_command() | ERROR: External command '/bin/bzcat -d /var/www/virtual/domain.net/backups/domain_j151.sql.bz2 | /usr/bin/mysql --user="username" --password="reallylongpassword11232323" --database="domain_j151"' returned '1' status !

This hasn't happened on the few other domains I have running on this box.

Ubuntu 8.04
ISPCP 1.0 stable

Any Ideas?

Thanks!