Starting openldap 2.2.24 with empty bdb database and incomplete slaptest man page

[Jaime Tomé Gomes Ventura <jaimeventura@ipp.pt>]

Hi,
I'm having the following problems.
When i try to start a new bdb database in my ldap server I get the 
following:

[root@ventura2 root]# /etc/init.d/ldap start
Checking configuration files for : slap_startup failed (test would 
succeed using the -u switch)
[root@ventura2 root]#                                      [FAILED]

When I try to run slaptest, this is what i get:

[root@ventura2 root]# slaptest -d-256
bdb_db_init: Initializing BDB database
bdb_db_open: db_open(/var/lib/ldap) failed: No such file or directory (2)
backend_startup: bi_db_open failed! (2)
slap_startup failed (test would succeed using the -u switch)
[root@ventura2 root]#
[root@ventura2 root]# ls -la /var/lib/ldap
total 392
drwx------   2 ldap ldap   4096 Mar 31 12:21 .
drwxr-xr-x  23 root root   4096 Mar 31 12:15 ..
-rw-------   1 root root  16384 Mar 31 12:21 __db.001
-rw-------   1 root root 278528 Mar 31 12:21 __db.002
-rw-------   1 root root  98304 Mar 31 12:21 __db.003
-rw-------   1 root root 450560 Mar 31 12:21 __db.004
-rw-------   1 root root  24576 Mar 31 12:21 __db.005
[root@ventura2 root]#
As you can see, the directory does existe and write permissions are 
given to ldap user

By the way, what means then "-u" switch? In the man page of slaptest 
that options does appeas.

Can someone help me please.
Is this a bug?
Thanks in advance.
Jaime Ventura