slapcat error 79?

[Dave Kusters <dave.kusters@cmg.nl>]

When I run ./slapcat -d1 -l /backup_scripts/tools/backup.ldif -f
/usr/local/openldap/etc/slapd.conf
I get the following debug information:

slapcat init: initiated tool.
slapcat startup: initiated.
backend_startup: starting database
=> ldbm_cache_open( "/usr/local/openldap/var/openldap-ldbm/id2entry.dbb", 0,
600 )
<= ldbm_cache_open NULL "/usr/local/openldap/var/openldap-ldbm/id2entry.dbb"
errno=79 reason="Error number 79 occurred")
Could not open/create id2entry.dbb

Can anyone tell me what this errno 79 means and why it occurs?

Thanks