Webpart Usercontrol in GAC

[Marc Looren]

When I store web parts, created as a user control (ASCX) in the GAC and try
to add the user control to a web part zone the following error occurred:

The "path" argument cannot be empty if the "type" argument is UserControl.

When adding a web part, created as WebControl and stored in the GAC no error
occurred.

Is it possible to create a web part as user control, store it in the GAC and
place them in a web part zone.

Anyone an idée?

Thanks