Error!! Need help~

[weilies]

i have overwrite my previous opengoo script but not reinstall it.
The DB still the same. But what's the possible cause my following error?

http://office.astudion.com/

Error
We are sorry, but a fatal error prevented Feng Office from executing your request. An Error Report has been sent to the administrator

[weilies]

i have tried to reinstall (in different enviroment)
It's ok (fresh install), then i dump all uploaded file to the new enviroment, but all the file is no longer there (but my file are in tmp folder)

[ignacio]

In order to upgrade you need to access your installation's 'public/upgrade'. Check the wiki: http://fengoffice.com/web/wiki/doku.php/installation

If you want to get more details about an error read the first post in the bugs forums or the wiki: http://fengoffice.com/web/wiki/doku.php/debugging