ldapjs error when adding user

Doing testing on ldapjs => ldapjs guide.

I am at the part, where a new enry is being added to ldap, giving the command:

ldapadd -H ldap://localhost:1389 -x -D cn=root -w secret -f ./user.ldif

the user.ldif file is the following (see link)

dn: cn=ldapjs, ou=users, o=myhost
objectClass: unixUser
cn: ldapjs
shell: /bin/bash
description: Created via ldapadd

However when giving the 'add' command, I get:

adding new entry "cn=ldapjs, ou=users, o=myhost"
ldap_add: Operations error (1)
matched DN: ou=users, o=myhost
additional info: Cannot read property 'ldapjs' of undefined

I do not get the given error. What is actually suppose to be done to fix this? I did not find any information about this.

Did more examples I found. Modified the '/etc/ldap/ldap.conf' according to this example. More specifically I tried modifying the 'ldap.conf'-file with only these schemas included (as in the example):

include         /usr/local/etc/openldap/schema/core.schema
include         /usr/local/etc/openldap/schema/cosine.schema
include         /usr/local/etc/openldap/schema/inetorgperson.schema

The rest does not seem to be (yet) relevant for the ldap.js test I am doing:

One of these schemas likely holds this 'unixUser' as a parent schema (or as an objectclass, included by inheritance).

Rebooted the 'slapd' service after the modifications to 'ldap.conf' (my bet it is needed, so didn't even try without reboot):

sudo /etc/init.d/slapd restart