[<NSCFArray> removeObserver:forKeyPath:] is not supported

FROM : unc
DATE : Mon Nov 05 20:16:31 2007

Hi there

I tried to open a NIB-file from an open source project. But I get this 
error:

---
The document "Main.nib" could not be opened. Der Vorgang konnte nicht 
abgeschlossen werden. (com.apple.InterfaceBuilder-Fehler -1.)
Check the console log for additional information.
---

The console log:

---
05.11.07 20:12:03 Interface Builder[2135] [<NSCFArray 0x189f2600> 
removeObserver:forKeyPath:] is not supported. Key path: 
appleScriptObjectName
---

I'm using Leopard (with IB 3.0). The developer used Tiger...

Google didn't help really...

Any help is appreciated.

Nils