LDAPIdentityProvider could not query for users

Hi,
I was able to connect my application with our Live-LDAP. I now need a test LDAP-Server with testdata and I tried to do it in the following way:

But know I always get this error:
Caused by: javax.naming.InvalidNameException: undefined,dc=ofv,dc=de: [LDAP: error code 34 - ERR_05132_INVALID_ROOT_DN Invalid root Dn given : undefined,dc=ofv,dc=de

It is the same when I use “Users” als searchBase.

Here is my configuration in standalone.xml
ldap://212.201.31.193:10389/

        <property name="baseDn">dc=ofv,dc=de</property>

        <property name="userSearchBase"></property>
        <property name="userSearchFilter">(objectclass=person)</property>

	            <property name="userIdAttribute">uid</property>
        <property name="userFirstnameAttribute">cn</property>
        <property name="userLastnameAttribute">sn</property>
        <property name="userEmailAttribute">mail</property>
        <property name="userPasswordAttribute">userpassword</property>

        <property name="groupSearchBase">ou=roles</property>
        <property name="groupSearchFilter">(objectclass=groupOfNames)</property>
        <property name="groupIdAttribute">ou</property>
        <property name="groupNameAttribute">cn</property>

        <property name="groupMemberAttribute">member</property>

      </properties>
    </plugin>
    <plugin>
      <class>org.camunda.bpm.engine.impl.plugin.AdministratorAuthorizationPlugin</class>
      <properties>
        <property name="administratorUserName">ofv2admin</property>
      </properties>
    </plugin>
                </plugins>

Any ideas? Thanks a lot,
Nicole