DBMS_ROWID.rowid_info无法正常工作

Question

我有这个PL-Sql代码不能正常工作。 但是，据我所知，应该工作。 数据库是Oracle 11g。

DECLARE
l_rowid_in         ROWID;
l_rowid_type       NUMBER;
l_object_number    NUMBER;
l_relative_fno     NUMBER;
l_block_number     NUMBER;
l_row_number       NUMBER;
BEGIN

SELECT ROWID INTO l_rowid_in FROM TABLENAME  a 
WHERE RECORD_ID_CALL_STR_ID = 'dummystring'
AND ROWNUM < 2;

dbms_rowid.rowid_info(rowid_in       =>l_rowid_in     ,
                      rowid_type     =>l_rowid_type   ,
                      object_number  =>l_object_number,
                      relative_fno   =>l_relative_fno ,
                      block_number   =>l_block_number ,
                      row_number     =>l_row_number   );
dbms_output.put_line('object_number ='||l_object_number);
END;
/

当我使用脚本运行此脚本时，它会给我错误

Error at line 1
ORA-06502: PL/SQL: numeric or value error
ORA-06512: a line 11

任何人都可以帮助我吗？这是一种奇怪的行为，谢谢。