d3forum-08 has no display.

In the Admin page:
When I click on the d3forum icon, it display a word "Forum" only.
Click on the "Advanced" and "Histories" menu item, it give me an empty page.
Click on the "Premissions" menu items, it ask me to create a category first.
However, when I click on the Preferences menu item, it show me the "Module Config Options" page.


In the user page:
When I click on the Forum menu item, nothing display on the screen.

I have installed altsys 0.55a and use PHP 5.2.1.

Please advice me how to fix these problems.

Thanks!