Error when trying to setup olcMirrorMode

Hello,

I'm trying to setup N-way multimaster replication for cn=config only (for the moment). I have problem when I try to add olcMirrorMode: TRUE. Here is my ldif file to do this:

dn: olcDatabase={0}config,cn=config changetype: modify add: olcMirrorMode olcMirrorMode: TRUE

and the error is the following :

root@ldap1:~/downloads/ldif/config# ldapmodify -Y EXTERNAL -H ldapi:// -f 7_addMirrorMode.ldif SASL/EXTERNAL authentication started SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth SASL SSF: 0 modifying entry "olcDatabase={0}config,cn=config" ldap_modify: Server is unwilling to perform (53) additional info: shadow context; no update referral

I have tried a lot of things but nothing working. Please I really need your help.

Thanks a lot.

Cyrill Gremaud