Print this post - Error messages when I drag and drop furniture.

Sometimes I am unable to drag and drop furniture.
1 times of 2, when I start the program, I can't drag and drop furniture. I start the program from the console with the command

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javaws SweetHome3D.4.0.beta.jnlp

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I click on a furniture, but when I drag it I get error messages in the consol.

System:
SH3D Version 4.0 Beta 11
on
Kubuntu 12.10 (Ubuntu with KDE)
Java version 1.6.0_24

The error text begins:

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Exception in thread "AWT-EventQueue-1" java.lang.ExceptionInInitializerError
        at com.eteks.sweethome3d.swing.FurnitureCatalogTransferHandler.createTransferable(Unknown Source)
        at javax.swing.TransferHandler$DragHandler.dragGestureRecognized(TransferHandler.java:1552)
        at java.awt.dnd.DragGestureRecognizer.fireDragGestureRecognized(DragGestureRecognizer.java:356)
        at javax.swing.TransferHandler$SwingDragGestureRecognizer.gestured(TransferHandler.java:1615)
        at javax.swing.TransferHandler.exportAsDrag(TransferHandler.java:690)
        at com.eteks.sweethome3d.swing.VisualTransferHandler.exportAsDrag(Unknown Source)
        at com.eteks.sweethome3d.swing.FurnitureCatalogTree$1.mouseDragged(Unknown Source)
        at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:320)
        at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:319)
....

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