RE: Combining Virtualmin and LDAP

I’ve been following this tutorial: http://www.virtualmin.com/documentation/id,combining_virtualmin_and_ldap

And I’m getting the following error:

Creating aliases for administration user …
… aliases failed : LDAP add of mailLocalAddress=gun-mage@gun-mage.com,dc=Virtual,dc=gun-mage,dc=com failed : mailacceptinggeneralid: attribute type undefined at /usr/share/webmin/web-lib-funcs.pl line 1332.

Anyone know what I’ve done wrong?