Error: cannot fetch last explain plan from PLAN_TABLE

Hi Gurus,

Oracle:11203

OS:RHEL 6

I'm getting the error "Error: cannot fetch last explain plan from PLAN_TABLE" whenever i try to see the execution plan from using "DBMS_XPLAN.DISPLAY".

SQL> select sysdate from dual;

SYSDATE
---------
24-NOV-14

SQL> select * from table(dbms_xplan.display);

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Error: cannot fetch last explain plan from PLAN_TABLE

SQL> select object_name,object_type,owner from dba_objects where object_name='PLAN_TABLE';

OBJECT_NAME     OBJECT_TYPE         OWNER
--------------- ------------------- ------------------------------
PLAN_TABLE      SYNONYM             PUBLIC

Please let me know how to fix the error.

Thanks