A Window pops up, that there is an error, i saw nothing unusual before

[sven@…]

Path: josm
URL: ​http://www.openstreetmap.de/svn/josm
Repository Root: ​http://www.openstreetmap.de/svn/josm
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Revision: 518
Node Kind: directory
Last Changed Author: gebner
Last Changed Rev: 518
Last Changed Date: 2008-01-09 20:41:15 +0100 (Wed, 09 Jan 2008)

java.lang.ClassCastException: java.lang.String

at java.awt.AWTEventMulticaster.mouseEntered(AWTEventMulticaster.java:241)
at java.awt.Component.processMouseEvent(Component.java:5497)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:4017)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3874)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

[stoecker]

Unreproducable.