java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.jdesktop.wonderland.server.spatial.impl.SpatialCellImpl.setRoot(SpatialCellImpl.java:441)
at org.jdesktop.wonderland.server.spatial.impl.SpatialCellImpl.setParent(SpatialCellImpl.java:454)
at org.jdesktop.wonderland.server.spatial.impl.SpatialCellImpl.addChild(SpatialCellImpl.java:176)
at org.jdesktop.wonderland.server.spatial.UniverseService$7.run(UniverseService.java:341)
at org.jdesktop.wonderland.server.spatial.UniverseService$ChangeApplication.run(UniverseService.java:933)

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