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forward class warning

Subject: forward class warning
From: email@hidden
Date: Wed, 14 Nov 2007 21:56:06 -0800
Delivered-to: email@hidden
Delivered-to: email@hidden

In Leopard I opened a project I created in Tiger. It now gets 3 warnings, just like the following:

warning: PreferenceController is a forward class and corresponding @interface may not exist.

PreferenceController is a NSWindowController subclass. I can't find anything about "forward class" when searching Apple's Developer Connection web site (not surprising). Can anyone explain to me what this warning means?

Thanks in advance.
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