[sc-users] swingOSC ERROR: Message 'isMetaClass' not understood.

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Hi,
I have installed Ubuntu 7.04
Ubuntu Studio Audio Packages
Supercollider runs in emacs perfectly

so next step: installing swingOSC
with installation steps on www.sciss.de/swingOSC
I get following problems on Supercollider startup (and even more failures if I try to run my sounds):

init_OSC
compiling class library..
	NumPrimitives = 508
	compiling dir: '/usr/share/SuperCollider/SCClassLibrary'
	compiling dir: '/usr/share/SuperCollider/Extensions'
	pass 1 done
	Extension overwriting Meta_Document-open
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Meta_Document-new
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Meta_Document-listener
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Meta_Document-numberOfOpen
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Meta_Document-newFromIndex
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Meta_Document-prGetLast
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Meta_Document-prGetIndexOfListener
		in file '/usr/share/SuperCollider/Extensions/scel/extDocument.sc'.
		Original method in file '/Common/GUI/Document.sc'.
	Extension overwriting Server-makeWindow
		in file '/usr/share/SuperCollider/Extensions/scel/extBuffer.sc'.
		Original method in file '/Common/GUI/PlusGUI/Control/ServerPlusGUI.sc'.
	Extension overwriting SynthDesc-makeWindow
		in file '/usr/share/SuperCollider/Extensions/scel/extBuffer.sc'.
		Original method in file '/Common/GUI/PlusGUI/Control/SynthDescPlusGUI.sc'.
	Extension overwriting Main-startup
		in file '/usr/share/SuperCollider/Extensions/linux/extMain.sc'.
		Original method in file '/DefaultLibrary/Main.sc'.
	Extension overwriting Main-shutdown
		in file '/usr/share/SuperCollider/Extensions/linux/extMain.sc'.
		Original method in file '/DefaultLibrary/Main.sc'.
	Extension overwriting Main-newSCWindow
		in file '/usr/share/SuperCollider/Extensions/linux/extMain.sc'.
		Original method in file '/DefaultLibrary/Main.sc'.
numentries = 750018 / 8368480 = 0.09
	Method Table Size 5479892 bytes
	Number of Method Selectors 3860
	Number of Classes 2168
	big table size 33473920
	Number of Symbols 9413
	Byte Code Size 278001
	compiled 340 files in 1.75 seconds 
compile done
Couldn't set realtime scheduling priority 1: Operation not permitted
Emacs: Initializing lisp interface.
LID: event loop started
ERROR: Message 'isMetaClass' not understood.
RECEIVER:
   nil
ARGS:
CALL STACK:
	DoesNotUnderstandError-reportError   082A78E0
		arg this = <instance of DoesNotUnderstandError>
	Nil-handleError   082A58E0
		arg this = nil
		arg error = <instance of DoesNotUnderstandError>
	Object-throw   082A5E70
		arg this = <instance of DoesNotUnderstandError>
	Object-doesNotUnderstand   082A1150
		arg this = nil
		arg selector = 'isMetaClass'
		arg args = [*0]
	Meta_Class-initClassTree   082D6DC0
		arg this = class Class
		arg aClass = nil
		var implementsInitClass = nil
		var methods = [*65]
	Meta_SwingGUI-initClass   082A0E80
		arg this = class SwingGUI
	Meta_Class-initClassTree   082D7960
		arg this = class Class
		arg aClass = class SwingGUI
		var implementsInitClass = true
		var methods = [*44]
	ArrayedCollection-do   08298580
		arg this = [*209]
		arg function = <instance of Function>
		var i = 182
	Meta_Class-initClassTree   082986D0
		arg this = class Class
		arg aClass = class Object
		var implementsInitClass = true
		var methods = [*12]
	Process-startup   082982F0
		arg this = <instance of Main>
		var time = 1192624429.577817
	Main-startup   08298290
		arg this = <instance of Main>
Couldn't set realtime scheduling priority 1: Operation not permitted
Emacs: Built symbol table in 0.22 seconds