[Drbl-user] mktemp: failed to create file via template `/tmp/ip_range.Aaj3vX': No space left on device

[msacks <nt...@gm...>]

I am getting an error message: mktemp: failed to create file via
template `/tmp/ip_range.Aaj3vX': No space left on device

There is plenty of free space on the system:
# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              30G   24G  5.3G  82% /
devtmpfs              998M   92K  997M   1% /dev
tmpfs                 998M     0  998M   0% /dev/shm
/dev/sda2              48G   13G   33G  28% /data

Here is the full error

Now add necessary services to this DRBL server: DHCP, TFTP, NFS, NIS...
Generating the NFS exports for DRBL clients...
Backup the original /etc/exports as /etc/exports.drblsave
Exporting to clients by IP address line-by-line...
mktemp: failed to create file via template `/tmp/ip_range.Aaj3vX': No
space left on device
/opt/drbl/bin/get-client-ip-list: line 40: $ip_range: ambiguous redirect


Full DRBL or Full Clonezilla mode, exporting client's directories etc,
var, root...
mktemp: failed to create file via template `/tmp/ip_range.t0yQbO': No
space left on device
/opt/drbl/bin/get-client-ip-list: line 40: $ip_range: ambiguous redirect

Any ideas why this might be happening?

drbl-1.9.7-28