What's mean ORA-25191?

ORA-25191: cannot reference overflow table of an index-organized table 
ORA-06512: at "SYS.DBMS_SYS_SQL", line 1474 
ORA-06512: at line 9 
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ORA-25191 cannot reference overflow table of an index-organized table
Cause: An attempt was made to directly access the overflow table of an index-organized table.
Action: Issue the statement against the parent index-organized table containing the specified overflow table.
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SQL> connect eygle/eygle
Connected.
SQL> CREATE TABLE TEST_IOT
  2        (id NUMBER PRIMARY KEY,
  3         C1 VARCHAR2(50),
  4         C2 VARCHAR2(10))
  5        ORGANIZATION INDEX PCTTHRESHOLD  10 OVERFLOW;
Table created.
SQL> col object_name for a30
SQL> select object_name,object_type from user_objects where object_name like '%IOT%';
OBJECT_NAME                    OBJECT_TYPE
------------------------------ ------------------
SYS_IOT_OVER_7370              TABLE
SYS_IOT_TOP_7370               INDEX
TEST_IOT                       TABLE
SQL> grant select on SYS_IOT_OVER_7370 to scott;
grant select on SYS_IOT_OVER_7370 to scott
                *
ERROR at line 1:
ORA-25191: cannot reference overflow table of an index-organized table
SQL> 
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