Problem Explanation:
====================
This can be caused by running the script 'catnoqueue.sql' without first dropping all the queue tables in the database. See [BUG:647800] which is fixed in 8.0.6.

Problem References:
===================
[BUG:647800]
Solution Explanation
====================
The script 'catnoqueue.sql' has been run which drops the tables DEF$AQCALL and DEF$AQERROR. The corresponding rows in SYS.EXPACT$ are not dropped. Prior to running 'catnoqueue.sql', check for and drop any existing queue tables. To ascertain the existence of any queue tables, from SQL*Plus issue the following command to list all queue tables:

SELECT * FROM dba_queue_tables

To drop the queue tables, from SQL*Plus issue the following command:

execute dbms_aqadm.drop_queue_table('')

Solution Description:
=====================
If 'catnoqueue.sql' has already been run, then you need to delete from SYS.EXPACT$ rows for non-existent queue tables. The following steps will allow a full export to run successfully: All rows from the SYS.EXPACT$ table for the function package DBMS_AQ_IMPORT_INTERNAL need to be deleted.

1. Login into Server Manager as INTERNAL or SYS; or, login into SQL*Plus as SYS

2. Enter the following SQL command:
DELETE FROM SYS.EXPACT$
WHERE FUNC_PACKAGE = 'DBMS_AQ_IMPORT_INTERNAL';

After the statement issue a 'commit' so the statement can take effect.

3. Exit Server Manager or SQL*Plus.

4. Now you should be able to do a full database export.