do a clean shutdown and try your create table again

Rem
Rem $Header: catnools.sql 02-may-2001.15:36:35 srtata Exp $
Rem
Rem catnools.sql
Rem
Rem Copyright (c) Oracle Corporation 2001. All Rights Reserved.
Rem
Rem NAME
Rem catnools.sql - <one-line expansion of the name>
Rem
Rem DESCRIPTION
Rem This script drops the OLS product and all of its LBACSYS
Rem objects from a database instance. All OLS policies will
Rem also be dropped but user tables will not have their OLS
Rem policy columns automatically dropped.
Rem
Rem NOTES
Rem Must be run as SYSDBA.
Rem
Rem MODIFIED (MM/DD/YY)
Rem srtata 05/02/01 - Add error handling.

WHENEVER SQLERROR EXIT;

BEGIN

-- Check the user who is executing this script.
if sys_context('userenv','session_user') != 'SYS' then
RAISE_APPLICATION_ERROR(-20000,
'Execute the script as user SYS as SYSDBA');
end if;
END;
/

WHENEVER SQLERROR CONTINUE;

-- drop OLS database triggers.
DROP TRIGGER LBACSYS.lbac$after_drop;
DROP TRIGGER LBACSYS.lbac$startup;
DROP TRIGGER LBACSYS.lbac$logon;
DROP TRIGGER LBACSYS.lbac$after_create;
DROP TRIGGER LBACSYS.lbac$before_alter;

-- copy system.aud$ back to sys.aud$.
DROP SYNONYM aud$;
CREATE TABLE SYS.aud$ AS SELECT * FROM SYSTEM.aud$;
CREATE INDEX SYS.i_aud1 ON SYS.aud$(sessionid, ses$tid);
DROP table SYSTEM.aud$;

-- cleanup OLS by removing any roles, contexts,or synonyms
-- owned by LBACSYS.
DECLARE

CURSOR lbacroles IS
SELECT granted_role
FROM dba_role_privs
WHERE grantee = 'LBACSYS'
AND granted_role like '%_DBA'
AND admin_option = 'YES';

CURSOR lbaccontexts IS
SELECT namespace
FROM dba_context
WHERE schema = 'LBACSYS';

CURSOR lbacsynonyms IS
SELECT synonym_name
FROM dba_synonyms
WHERE table_owner = 'LBACSYS';

rolename VARCHAR2(30);

BEGIN

-- drop roles
FOR r IN lbacroles LOOP
dbms_output.put_line('Dropping role ' || r.granted_role );

BEGIN
EXECUTE IMMEDIATE 'DROP ROLE ' || r.granted_role;
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Unable to drop role ' || r.granted_role);
END;

END LOOP;

-- drop contexts
FOR c IN lbaccontexts LOOP
dbms_output.put_line('Dropping context ' || c.namespace);

BEGIN
EXECUTE IMMEDIATE 'DROP CONTEXT ' || c.namespace;
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Unable to drop context ' || c.namespace);
END;

END LOOP;

-- drop synonyms
FOR s IN lbacsynonyms LOOP
dbms_output.put_line('Dropping public synonym ' || s.synonym_name);

BEGIN
EXECUTE IMMEDIATE 'DROP PUBLIC SYNONYM ' || s.synonym_name;
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Unable to drop synonym ' || s.synonym_name);
END;

END LOOP;

END;
/

-- now remove lbacsys account and it's content
DROP USER LBACSYS CASCADE;
DELETE FROM exppkgact$ WHERE PACKAGE = 'LBAC_UTL';
COMMIT;

REM end of catnools.sql