ERROR: pull_var_clause: Cannot handle node type 108

What does it mean?

prova=> select nome from prova group by nome having count(*) > 1;
nome
Carlos
Henrique
Jose
(3 rows)

prova=> select oid,* from prova where nome in (select nome from prova
group by nome having 1 < count(*));
ERROR: pull_var_clause: Cannot handle node type 108

prova=> select * from prova where nome in (select nome from prova group
by nome having count(*) > 1);
ERROR: rewrite: aggregate column of view must be at rigth side in qual

José