"The tuple structure of a not-yet-assigned record is indeterminate."

In my function I have (kept the im****tant part)

CREATE OR REPLACE FUNCTION foo() RETURNS SETOF RECORD AS $$
DECLARE
	retval RECORD;
BEGIN
     some loop
           retval.jd := tmp.id;
           retval.d2 := _c2;
           retval.d3 := _c3;
           RETURN NEXT retval;
    end loop
return;
END;

and I get

ERROR:  record "retval" is not assigned yet
DETAIL:  The tuple structure of a not-yet-assigned record is
indeterminate.
CONTEXT:  PL/pgSQL function "foo" line 33 at assignment

It seems that the line with   retval.jd := tmp.id;  is where it stops.
Any suggestion on how to fix this error?

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