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I am testing the GridlockWithUI.java with mason.18.jar. An error of TimeSeriesChartGenerator is reported as follows:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at sim.app.geo.gridlock.GridlockWithUI.start(GridlockWithUI.java:100)

The problem is in the line of "trafficChart.removeAllSeries();". I guess the TimeSeriesChartGenerator object is not correctly constructed.

Does anyone know about this problem? Thanks!