Help with test case compilation error

Question

I keep getting this error cant figure out why??
Warning: compiled but with compilation errors
Errors for PACKAGE BODY FF1_PKG
LINE/COL ERROR
*11/28 PLS-00386: type mismatch found at 'FF1_TB_OUT' between FETCH curs*
or and INTO variables
*11/1 PL/SQL: SQL Statement ignored*
--desc user_cons_columns
drop type ff1_tb;
drop type ff1_typ;
create or replace type ff1_typ as object( tb varchar2(30),col varchar2(4000));
create or replace type ff1_tb as table of ff1_typ;
desc user_cons_columns
create or replace package ff1_pkg is
function ff1 (rownumx number) return ff1_tb;
maxrow number default 10000;
cursor c1(p_rownum number) is select table_name,column_name from user_cons_columns where rownum < p_rownum;
end ff1_pkg;
show errors;
CREATE OR REPLACE PACKAGE BODY ff1_pkg IS
function ff1(rownumx number) return ff1_tb is
ff1_tb_out ff1_tb;
begin
open c1(rownumx);
loop
fetch c1 bulk collect into ff1_tb_out limit maxrow;
exit when c1%notfound;
end loop;
return ff1_tb_out;
end;
end ff1_pkg;
show errors;

Answer 1

but it works when do a using cast(multiset())?? why??
--desc user_cons_columns
drop type ff1_tb;
drop type ff1_typ;
create or replace type ff1_typ as object( tb varchar2(30),col varchar2(4000));
create or replace type ff1_tb as table of ff1_typ;
desc user_cons_columns
create or replace package ff1_pkg is
function ff1 (rownumx number) return ff1_tb;
maxrow number default 10000;
cursor c1(p_rownum number) is select table_name,column_name from user_cons_columns where rownum < p_rownum;
end ff1_pkg;
show errors;
CREATE OR REPLACE PACKAGE BODY ff1_pkg IS
function ff1(rownumx number) return ff1_tb is
ff1_tb_out ff1_tb;
begin
select cast( multiset(select table_name,column_name from user_cons_columns where rownum < rownumx  ) as ff1_tb)  into ff1_tb_out from dual;
open c1(rownumx);
loop
fetch c1 bulk collect into ff1_tb_out limit maxrow;
exit when c1%notfound;
end loop;
return ff1_tb_out;
end ff1;
end ff1_pkg;
show errors;