i face prob with the returned cursor from function ,i created function to return cursor ,and in the script  ,i use the function to give me the cursor after that in loop i try to print all data that is in the cursor .

but it didnt work , and it say  invalid cursor  

that is my  code  : 
------------------ creating the function ------------------------------

CREATE OR REPLACE FUNCTION GETDATA 
(
  P_MANAGER_ID IN NUMBER  
) RETURN  SYS_REFCURSOR IS 
EMPS sys_refcursor;
V_LNAME VARCHAR2(20);
V_FNAME VARCHAR2(20);
V_TOTAL NUMBER;

BEGIN
OPEN EMPS for SELECT LAST_NAME,FIRST_NAME 
FROM EMPLOYEES 
WHERE MANAGER_ID =  P_MANAGER_ID  ;
CLOSE EMPS;
RETURN EMPS;
END GETDATA;

--------------------------------------------------------------
--------------------lister  the result --------------------

SET SERVEROUTPUT ON;
DECLARE 
 LISTS SYS_REFCURSOR ;
V_LAST EMPLOYEES.LAST_NAME%TYPE;
V_FIRST EMPLOYEES.FIRST_NAME%TYPE;
BEGIN 
LISTS :=GETDATA(100);
LOOP
FETCH LISTS INTO V_LAST ,V_FIRST;
EXIT WHEN LISTS%NOTFOUND;
dbms_output.put_line(V_LAST||','||V_FIRST);
END LOOP;
END;



thanks  ;