Initializing table types in Oracle -

i have such simple procedure , typetest table type.

create or replace procedure testprocedure (dayname out typetest )is  begin dayname(1):='monday'; dayname(2):='1'; dayname(3):='good'; end testprocedure;  create or replace type typetest table of  varchar2(50); 

it compiles normally, when run it, gives such exception:

"ora-06531:reference uninitialized collection".

can me please?

initialize dayname , extend (each time 1 or @ beginning 3):

create or replace procedure testprocedure (dayname out typetest )is begin   dayname := typetest();   dayname.extend(3);   dayname(1):='monday';   dayname(2):='1';   dayname(3):='good'; end testprocedure; 

test:

declare    t typetest; begin    testprocedure(t);    in 1..t.count() loop     dbms_output.put_line(t(i));   end loop; end; 

output:

monday 1