--- ProjectDocument.m.orig	Sun Jul  9 16:11:43 2006
+++ ProjectDocument.m	Mon Apr 30 10:54:26 2007
@@ -28,6 +28,7 @@
 #import <Foundation/NSDictionary.h>
 #import <Foundation/NSUserDefaults.h>
 #import <Foundation/NSProcessInfo.h>
+#import <Foundation/NSError.h>
 
 #import <AppKit/NSWorkspace.h>
 #import <AppKit/NSDocumentController.h>