linux build 59 crashes while starting

I can't start wuala any longer. It always crashes shortly after login. The stacktrace shows a NoClassDefFound on the class ZL
I run Ubuntu 7.10 and sun jdk 1.6_03

com/wuala/obfuscated/ZL

Build: Linux 59

App: Domain Application, user: trisa

(Data Application, not connected

(Common Application Alpha Linux 59))

Date: Feb 4, 2008

OS: Linux 1.6.0_03 Sun Microsystems Inc.

Memory: 254 MB max 2.9 MB free 4.9 MB total
Local Host: pmobile-adietisheim/127.0.1.1

Exception: java.lang.Exception: com.wuala.common.exception.ApplicationRuntimeException: com/wuala/obfuscated/ZL
at com.wuala.obfuscated.xM.a(Z:168)
at com.wuala.common.exception.ApplicationRuntimeException.createReport(Z:64)
at com.wuala.obfuscated.kw.<init>(Z:31)
at com.wuala.obfuscated.rB.a(Z:258)
at com.wuala.obfuscated.rB.a(Z:152)
at com.wuala.obfuscated.rB.a(Z:114)
at com.wuala.platform.Wuala.launch2(Z:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.wuala.loader.starter.ReflectiveWrapper.invoke(ReflectiveWrapper.java:38)
at com.wuala.loader.starter.ApplicationWrapper.launch(ApplicationWrapper.java:19)
at com.wuala.loader.Loader.run(Loader.java:63)
at com.wuala.loader.Loader.main(Loader.java:134)
Caused by: com.wuala.common.exception.ApplicationRuntimeException: com/wuala/obfuscated/ZL
at com.wuala.obfuscated.dp.uncaughtException(Z:21)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:970)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:965)
at java.lang.Thread.dispatchUncaughtException(Thread.java:1821)
Caused by: java.lang.NoClassDefFoundError: com/wuala/obfuscated/ZL
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.wuala.loader.starter.WualaClassLoader.findWualaClass(WualaClassLoader.java:48)
at com.wuala.loader.starter.WualaClassLoader.loadClass(WualaClassLoader.java:30)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.wuala.obfuscated.jG.a(Z:171)
at com.wuala.obfuscated.hf.a(Z:61)
at com.wuala.obfuscated.hf.a(Z:54)
at com.wuala.obfuscated.ZR.run(Z:77)
at com.wuala.obfuscated.ij.run(Z:37)
at com.wuala.obfuscated.ZD.run(Z:72)

--------------------------------------------

com.wuala.common.exception.ApplicationRuntimeException: com/wuala/obfuscated/ZL
at com.wuala.obfuscated.dp.uncaughtException(Z:21)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:970)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:965)
at java.lang.Thread.dispatchUncaughtException(Thread.java:1821)
Caused by: java.lang.NoClassDefFoundError: com/wuala/obfuscated/ZL
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.wuala.loader.starter.WualaClassLoader.findWualaClass(WualaClassLoader.java:48)
at com.wuala.loader.starter.WualaClassLoader.loadClass(WualaClassLoader.java:30)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.wuala.obfuscated.jG.a(Z:171)
at com.wuala.obfuscated.hf.a(Z:61)
at com.wuala.obfuscated.hf.a(Z:54)
at com.wuala.obfuscated.ZR.run(Z:77)
at com.wuala.obfuscated.ij.run(Z:37)
at com.wuala.obfuscated.ZD.run(Z:72)

--------------------------------------------

java.lang.NoClassDefFoundError: com/wuala/obfuscated/ZL
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.wuala.loader.starter.WualaClassLoader.findWualaClass(WualaClassLoader.java:48)
at com.wuala.loader.starter.WualaClassLoader.loadClass(WualaClassLoader.java:30)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.wuala.obfuscated.jG.a(Z:171)
at com.wuala.obfuscated.hf.a(Z:61)
at com.wuala.obfuscated.hf.a(Z:54)
at com.wuala.obfuscated.ZR.run(Z:77)
at com.wuala.obfuscated.ij.run(Z:37)
at com.wuala.obfuscated.ZD.run(Z:72)

Thread: main</init>