[horde] sequentiales tables in postgress

[Estela Corina Macías Terán]

Hi, I can't save changes in postgres tables, first i was using mysql and all
working good, In fact, mysql created tables sequentials horde_datatree_seq and
and so horde_histories_seq. But in postgres, when i want to create groups or
privileges, for some reason does not work. 

In my log shows this error:
Jul 06 23:45:19 HORDE [error] [horde] DB Error: unknown error: SELECT
NEXTVAL('horde_datatree_seq') [nativecode=ERROR:  no existe la relación
«horde_datatree_seq»] [on line 451 of
"/var/www/html/horde/lib/Horde/DataTree/sql.php"]


privileges in database is correct, i don't know if i can create these seq tables
manually?

I really apreciatte your help!!!