Monitor Error pls help

Merry Christmas.
After I install Webmethods 6.1, but I find Monitor is not available, Below is the error in detail:
Failed getting instance list (java.sql.SQLException: [wm-cjdbc33-0069][Oracle JDBC Driver][Oracle]ORA-00904: “T1”.“AUDITTIMESTAMP”: invalid identifier )
Your help is appreciated.

Was this a new installation - or did you use a pre-existing database? If so, did you run the database migration scripts?