xcode4 - MonoMac: and Xcode 4.0 error: "Unknown Window class MainWindow in Interface Builder file" -

I've opened MainWindow.xib with a new MonoMac project and Interface Builder (Xcode). After making a simple change (name has been changed), the project can not be made anymore. Does anyone know how to fix it

I monodevelop 2.6 I am using, MonoFramework-2.10.1 on OS X 10.6.7 Xcode 4.0 with

This error the message?.:

2011-03-28 18: 45: 39.986 HelloWorld [30,332: 613] interface incognito window builder file class MainWindow, instead of the usual window

Exceptions without verb: system. Unexpected exception: Can not insert destination type from source type. On HelloWorld Manvindo Controller.get_window () & lt; 0x0002e & gt; On HelloWorld AppDelegate.FinishedLaunching (MonoMac.Foundation.NSObject) & lt; 0x0003d & gt; The casing (dynamic method) object [HelloWorld.AppDelegate.Void FinishedLaunching (MonoMac.Foundation.NSObject)] (MonoMac.Foundation.NSObject, MonoMac.ObjCRuntime.Selector, MonoMac.Foundation.NSObject). & Lt; 0x00033 & gt; The casing (native-to-managed) object [HelloWorld.AppDelegate.Void FinishedLaunching (MonoMac.Foundation.NSObject)] (MonoMac.Foundation.NSObject, MonoMac.ObjCRuntime.Selector, MonoMac.Foundation.NSObject). & Lt; 0x000eb & gt; (Wrapper managed-to-Netiwh) MonoMac.AppKit.NSApplication.NSApplicationMain (int, String []) & lt; 0x00003 & gt; MonoMac.AppKit.NSApplication.Main (string []) & lt; 0x00017 & gt; HelloWorld.MainClass.Main (string []) & lt; 0x00019 & gt;

Thanks for any help

Cheers

PS:. I found a troubleshooting help but I think that does not count in this case, since the main menu is already present by default.

I think I got the answer:

Xcode 4.0 is not actually supported right now .. but I hope someone else will improve me: -)