Centera SDK and ASP: Unable to load PAI ModuleException

I've created a dll (Centera.dll) in vb.net, with reference to library FPSDK.
If i use the dll from a windows application Net, the connection with the CAS is successful but if I use the same dll (registered with regasm .. dll / codebase)  from an ASP page (vbsrcipt: Set com=Server.CreateObject("Centera.CAS")), when i call the function for Centera connection  I get the error Unable to load PAI Module Exception . All SDK libraries (including pai_module) ,my library Centera.dll  and my ASP page are in the same folder and all users have rights to access this folder. Any ideas? Thanks