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On Sep 25, 2017, at 9:34 AM, Mr Huanfa Chen <[log in to unmask]> wrote: > The problem is in the line of "trafficChart.removeAllSeries();". I guess the TimeSeriesChartGenerator object is not correctly constructed. I can't look into it immediately, but if it's a null pointer exception, then it means that the trafficChart variable is null at that point. Perhaps it had not yet been built? Sean