Unexpected exception when opening "Preferences..."

[pdvisschere@…]

What steps will reproduce the problem?

1. Opening "Preferences..."

What is the expected result? Opening Preferences

What happens instead? "Unexpected exception"

Please provide any additional information below. Attach a screenshot if
possible.

Build-Date: 2010-04-11 18:15:05
Is-Local-Build: true
Revision: 3177

Memory Usage: 59 MB / 63 MB (25 MB allocated, but free)
Java version: 1.5.0_22, Apple Inc., Java HotSpot(TM) Client VM
Operating system: Mac OS X

Dataset consistency test:
No problems found


Plugins: validator,waydownloader,wmsplugin
Plugin validator (Version: 20579)
Plugin wmsplugin (Version: 20566)
Plugin waydownloader (Version: 19489)

java.lang.NoClassDefFoundError: org/openstreetmap/josm/gui/preferences/PrefJPanel
	at org.openstreetmap.josm.gui.preferences.ShortcutPreference$Factory.createPreferenceSetting(ShortcutPreference.java:18)
	at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane.buildGui(PreferenceTabbedPane.java:201)
	at org.openstreetmap.josm.gui.preferences.PreferenceDialog.build(PreferenceDialog.java:48)
	at org.openstreetmap.josm.gui.preferences.PreferenceDialog.<init>(PreferenceDialog.java:61)
	at org.openstreetmap.josm.actions.PreferencesAction.run(PreferencesAction.java:38)
	at org.openstreetmap.josm.actions.PreferencesAction.actionPerformed(PreferencesAction.java:34)
	at org.openstreetmap.josm.tools.PlatformHookOsx.invoke(PlatformHookOsx.java:54)
	at $Proxy0.handlePreferences(Unknown Source)
	at com.apple.eawt.Application$5.run(Application.java:455)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

[bastiK]

try ant clean dist

[pdvisschere@…]

I did a clean build and the problem was gone;