create table t1 (
   x int,
   y int,
   z varchar2(100),
   constraint t_pk primary key (x) 
)
organization index
tablespace indx

insert into t1
select object_id, data_object_id, object_name
from all_objects
where rownum <= 100;

SQL> select dbms_rowid.rowid_block_number(rowid, 'SMALLFILE') rbn, x, y
  2  from t1
  3  /
select dbms_rowid.rowid_block_number(rowid, 'SMALLFILE') rbn, x, y
       *
ERROR at line 1:
ORA-06553: PLS-306: wrong number or types of arguments in call to 'ROWID_BLOCK_NUMBER'

SQL> select dbms_rowid.rowid_block_number(rowid) rbn
  2  from t1;
select dbms_rowid.rowid_block_number(rowid) rbn
       *
ERROR at line 1:
ORA-06553: PLS-306: wrong number or types of arguments in call to 'ROWID_BLOCK_NUMBER'