How to insert or update to user_type fields

hi all,
i created an user type as,
create or replace type file_ty as object(name varchar2(100), content blob);
file_ty is created.
and a table which is using this type,
create table issues (id number primary key, subj varchar2(20), area varchar2(20), filename file_ty);
when i tried to insert data in issues table,
insert into issues values(1,'subj',area',file_ty('one.txt'));
Error Msg : ORA-02315: incorrect number of arguments for default constructor
and i tried to insert a record with out filename field and it inserted.
insert into issues(id,subj,area) values(1,'subj','area');
and tried to update that record.
update issues set filename.name='one.txt' where id=1
Error Msg: ORA-00904: "FILENAME"."NAME": invalid identifier
i event tried for user_type which have two fields of number. but the same errors.
create type temp_ty as object(fld1 number, fld2 number);
how to resolve this problem.
regards
pavan.

SQL> create or replace type file_ty as object(name varchar2(100), content blob);
2 /
Type is aangemaakt.
SQL> create table issues (id number primary key, subj varchar2(20), area varchar2(20), filename file_ty)
2 /
Tabel is aangemaakt.
SQL> insert into issues values(1,'subj','area',file_ty('one.txt'))
2 /
insert into issues values(1,'subj','area',file_ty('one.txt'))
FOUT in regel 1:
.ORA-02315: incorrect number of arguments for default constructor
SQL> insert into issues values(1,'subj','area',file_ty('one.txt',null))
2 /
1 rij is aangemaakt.Regards,
Rob.

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