error when opening file

[anonymous]

opened gpx-file by commandline option -> error

Build-Date: 2009-12-12 23:14:11		
Revision: 2623
Is-Local-Build: true

Memory Usage: 37 MB / 595 MB (12 MB allocated, but free)
Java version: 1.6.0_15



java.lang.NullPointerException
	at org.openstreetmap.josm.data.osm.event.DatasetEventManager.activeLayerChange(DatasetEventManager.java:71)
	at org.openstreetmap.josm.gui.MapView.fireActiveLayerChanged(MapView.java:107)
	at org.openstreetmap.josm.gui.MapView.setActiveLayer(MapView.java:581)
	at org.openstreetmap.josm.gui.MapView.addLayer(MapView.java:248)
	at org.openstreetmap.josm.Main.addLayer(Main.java:246)
	at org.openstreetmap.josm.io.GpxImporter$1.run(GpxImporter.java:56)
	at org.openstreetmap.josm.io.GpxImporter.importData(GpxImporter.java:67)
	at org.openstreetmap.josm.actions.OpenFileAction.openFile(OpenFileAction.java:60)
	at org.openstreetmap.josm.Main.downloadFromParamString(Main.java:498)
	at org.openstreetmap.josm.Main.postConstructorProcessCmdLine(Main.java:377)
	at org.openstreetmap.josm.gui.MainApplication$2.run(MainApplication.java:164)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[anonymous]

Closed as duplicate of #4159.