plsql - Call Oracle function with a cursor IN/OUT -

i trying make simple call function(test2) takes cursor, , returns cursor.

i stuck error:
error(23,17): pls-00306: wrong number or types of arguments in call 'test2'

what wrong function call?

v_resp := test2(v_req); 

here test:

create or replace type trans_obj object (transno char(8)); create or replace type trans_obj_tab table of trans_obj;  create or replace function test2 (v_rc in sys_refcursor) return trans_obj_tab   v_resp trans_obj_tab := trans_obj_tab();    begin      v_resp.extend;     v_resp(1) := trans_obj('222222');     return v_resp;    end;  create or replace function test1 return trans_obj_tab   transno   char(8);   v_cnt number := 0;   v_req trans_obj_tab := trans_obj_tab();   v_resp trans_obj_tab := trans_obj_tab();   --v_resp sys_refcursor;          cursor v_rc select '1111' transno dual;    begin       open v_rc;        loop         fetch v_rc transno;         exit when v_rc%notfound;          v_req.extend;         v_cnt := v_cnt + 1;         v_req(v_cnt)  := trans_obj(transno);       end loop;        close v_rc;       v_resp := test2(v_req);       return v_resp;     end; / drop type trans_obj_tab; drop type trans_obj; drop function test1; drop function test2; 

first not returning cursor test2 function says (try return sys_refcursor). on other hand v_req not sys_refcursor, besides v_resp can't contains cursor too. review types using. hope help!!!