Expdp error UDE-22303
SQL&gt; show parameter aq

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes                      integer     0

SQL&gt; show parameter streams_pool_size

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
streams_pool_size                    big integer 0

SQL&gt; show parameter db_cache_size

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_cache_size                        big integer 24G


Solution:

SQL&gt; alter system set aq_tm_processes=1 scope=both sid='*';
SQL&gt; alter system set streams_pool_size = 256M scope = both sid='*';


If you get any error like this:

ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-04033: Insufficient memory to grow pool


Reduce the db_cache_size: 

SQL&gt; alter system set db_cache_size = 12G scope = both sid='*';


and re-run:

SQL&gt; alter system set streams_pool_size = 256M scope = both sid='*';


Now, you can run the expdp again without issues. Once done, don't forget to roll back all changes.