plugin Osmarender don't work

[efred]

What steps will reproduce the problem?

1. download an area to josm
2. click on "View / Osmarender" (Ansicht / Osmarender)

What is the expected result?
the plugin should show the visible area from josm in firefox.

What happens instead?
get an errormessage: "Eine unvorhergesehene Fehlersituation trat auf, die das Plugin "osmarender" ausgelöst haben könnte....."

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-03-18 02:31:03
Last Changed Author: Gubaer
Revision: 3141
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-03-17 11:11:55 +0100 (Wed, 17 Mar 2010)
Last Changed Rev: 3141

Memory Usage: 40 MB / 494 MB (8 MB allocated, but free)
Java version: 1.6.0_18, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows XP

Dataset consistency test:
No problems found


Plugins: PicLayer,buildings_tools,multipoly,osmarender,validator,wmsplugin
Plugin wmsplugin (Version: 19992)
Plugin PicLayer (Version: 20217)
Plugin buildings_tools (Version: 20269)
Plugin validator (Version: 20426)
Plugin osmarender (Version: 19419)
Plugin multipoly (Version: 19456)

org.openstreetmap.josm.data.osm.DataIntegrityProblemException: Primitive cannot be included in more than one Dataset
	at org.openstreetmap.josm.data.osm.OsmPrimitive.setDataset(OsmPrimitive.java:152)
	at org.openstreetmap.josm.data.osm.DataSet.addPrimitive(DataSet.

[anonymous]

Closed as duplicate of #5022.