I tried NetBeans with Nimbus of 1.6.0_05-ea-b04, but some exceptions happen and editor can not be opened. Is this known issue? I attached the full log file of NetBeans.

NetBeans 6.0 Beta1 (200709141330)
1.6.0_05-ea-b04
Windows XP version 5.1 running on x86 (Japanese)

java.lang.NullPointerException^M
        at org.netbeans.modules.editor.settings.storage.CompositeFCS.<clinit>(CompositeFCS.java:52)^M
Caused: java.lang.ExceptionInInitializerError^M
        at org.netbeans.modules.editor.settings.storage.SettingsProvider$MyLookup.initialize(SettingsProvider.java:164)^M
        at org.openide.util.lookup.AbstractLookup.enterStorage(AbstractLookup.java:138)^M
        at org.openide.util.lookup.AbstractLookup.lookupItem(AbstractLookup.java:351)^M
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:343)^M
        at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:192)^M

java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.modules.editor.settings.storage.CompositeFCS^M
        at org.netbeans.modules.editor.settings.storage.SettingsProvider$MyLookup.initialize(SettingsProvider.java:164)^M
        at org.openide.util.lookup.AbstractLookup.enterStorage(AbstractLookup.java:138)^M
        at org.openide.util.lookup.AbstractLookup.lookupItem(AbstractLookup.java:351)^M
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:343)^M
        at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:192)^M
        at org.netbeans.modules.editor.impl.KitsTracker.reload(KitsTracker.java:201)^M

java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.modules.editor.settings.storage.CompositeFCS^M
        at org.netbeans.modules.editor.settings.storage.SettingsProvider$MyLookup.initialize(SettingsProvider.java:164)^M
        at org.openide.util.lookup.AbstractLookup.enterStorage(AbstractLookup.java:138)^M
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:406)^M
        at org.openide.util.lookup.ProxyLookup$R.initResults(ProxyLookup.java:305)^M
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:554)^M
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:427)^M
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:400)^M