dbms_sql cursor_name as a parameter error

 CREATE OR REPLACE FUNCTION fpp2(cur IN INTEGER) RETURN INTEGER
IS 
rows_processed INTEGER;
BEGIN 
      dbms_output.PUT_LINE('cursor_fp2:' || cur);
      rows_processed := DBMS_SQL.EXECUTE(cur);
     RETURN rows_processed;
END;
 

DECLARE 
    cur INTEGER;
    rows_processed INTEGER;
BEGIN
    cur := dbms_sql.open_cursor;
    DBMS_SQL.PARSE(cur, 'select * from t1',
                   DBMS_SQL.NATIVE);
   -- rows_processed:=  DBMS_SQL.EXECUTE(cursor_name);
     dbms_output.PUT_LINE('cursor_nam:' || cur);
     rows_processed := fpp2(cur);
    DBMS_SQL.CLOSE_CURSOR(cur);
    dbms_output.PUT_LINE('1234');
EXCEPTION
WHEN OTHERS THEN
    dbms_output.PUT_LINE('123'|| sqlerrm);
    DBMS_SQL.CLOSE_CURSOR(cur);
END;

result is ORA-29470 effective user or roles are not the same when the cursor was parsed

how to fix fpp2 function ? oracle dbms_sql not support cursor as parameter ?