SQL & PL/SQL :: Unable To Allocate 104 Bytes Of Shared Memory

When i try to extract create statement of table i get below error message.

SQL>
SQL> set heading off
SQL> set pagesize 0
SQL> set long 1000000
SQL> set feedback off
SQL> select
2 dbms_metadata.get_ddl( 'TABLE','CATALOG_TBL','JACK')
3 from
4 dual
5 /

ERROR:

ORA-04031: unable to allocate 104 bytes of shared memory ("shared pool",

"SELECT
/*+rule*/ SYS_XMLGEN(...","SQLA^fc8f5280","qecsub : qkxrPXformQbc")
ORA-06512: at "SYS.DBMS_METADATA", line 2625
ORA-06512: at "SYS.DBMS_METADATA", line 2668
ORA-06512: at "SYS.DBMS_METADATA", line 2983
ORA-06512: at "SYS.DBMS_METADATA", line 3897
ORA-06512: at "SYS.DBMS_METADATA", line 5678
ORA-06512: at line 1

Note:
----
I am executing this command from another user 'DEMO' which has got DBA privilege.

how to fix this error and extract the create table statement.