Help please! System.Runtime.InteropServices.ComException !!!

I built a website using VS 2005 Beta 2 on my laptop running XP. The site references a required .dll. The site works fine on my laptop. When I deployed the website and (registered).dll to the server (Windows 2003 Server). I keep getting the following Server Error:

Object variable or With block variable not set.

System.Runtime.InteropServices.ComException: Object variable or With block variable not set

I believe it is a permissions issue but I have tried changing some settings and still cannot figure out why the site will not work.

I even installed VS WebExpress on the server, and added the dll as a reference. Intellisense works but at runtime the dll won't work.

Please help!

Thanks in advance.