Content must have a ListView whose id attribute is

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http://stackoverflow.com – I have setup chart engine it worked fine and after try to add one more graph to chart, I got following error message on log cat. There is no list in the code though it is extendds from listactivity. what is the wrong with the code. package org.achartengine.chartdemo.demo; import java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.GregorianCalendar; import org.achartengine.ChartFactory; import org.achartengine.GraphicalView; import org.achartengine.chart.PointStyle; import org.achartengine.model.SeriesSelection; import org.achartengine.model.TimeSeri (HowTos)