I got an "already existing" error when running
After looking into the code and debugging it, I figured
out that the installation of the script "ut_plsql_util.pkb"
is the reason for the bug.
The procedure utplsql_util.execute_ddl contains wrong
installation hints for the different Oracle versions. The
variables &start73 and &start81 are commented (--).
This leads to an uncommented comment and to the
situation that the DDL statement (which is CREATE
TABLE) is executed twice :-(