dynamic expansion will not be dynamically expanded in ldap configuration

Hello, I'm trying to configure ldap module for freeradius. For group membership I have this configuration: membership_filter = "(&(uid=%{User-Name})(objectClass=posixAccount))" but whenever I start freeradius, I get the error /etc/freeradius/mods-enabled/ldap[176]: Found dynamic expansion in string which will not be dynamically expanded where the membership_filter option is at line 176 of the ldap file. And when I user logins, there is no group search in the ldap, only a search to find the user. What am I doing wrong? -- Angel L. Mateo Martínez Sección de Telemática Área de Tecnologías de la Información y las Comunicaciones Aplicadas (ATICA) http://www.um.es/atica Tfo: 868887590 Fax: 868888337