[Dart] Null pointer exception

[Florimond Ployette]

Hello,
We use Dart2 version 0.6.0 and we have a recurrent null pointer exception,
I have seen the same error in the archive in 2005 but it seems it has 
not been fixed:

<25 sept. 2007 09:20:08,750> [SocketListener0-11] ERROR 
dart.server.track.TemporalTrack
        CardioViz3D: Failed to find track
java.lang.NullPointerException
        at java.util.Calendar.setTime(Calendar.java:1032)
        at dart.server.track.TemporalTrack.getTrackId(TemporalTrack.java:73)
        at dart.server.TrackManager.getTrackIds(TrackManager.java:45)
        at dart.server.servlet.Dashboard.doGet(Dashboard.java:196)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:413)
        at 
org.mortbay.jetty.servlet.ServletHandler.dispatch(ServletHandler.java:665)
        at 
org.mortbay.jetty.servlet.Dispatcher.dispatch(Dispatcher.java:265)
        at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:156)
        at dart.server.servlet.Dashboard.doGet(Dashboard.java:92)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:413)
        at 
org.mortbay.jetty.servlet.ServletHandler.dispatch(ServletHandler.java:665)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:569)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1434)
        at org.mortbay.http.HttpServer.service(HttpServer.java:896)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
        at 
org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
        at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:366)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)

Thank you for your help,
Florimond.