what is this error and how can I solve it?
This message occurs when I open ISPAdmin/default.aspx source in vs.net(2003)

The file could not be loaded into the Web Forms designer . Please correct the following error
and then try loading it again:
The designer could not be shown for this file because none of the classes within it can be designed .
The designer inspectedthe following classes in the file:
_default---The base class 'ASPNET.StarterKit.Communities.BaseISPAdminPage' could not be loaded.
Ensure the assembly has been refrenced or build if it is part of the project.
Make sure all of the classes used in the page are built or referenced in the project.