Intenté usar la demostración de achartengine, pero cada vez que hago clic en algo para mostrar el gráfico aparece un error que dice "La aplicación AChartengine se detuvo inesperadamente. Inténtelo de nuevo". Alguien sabe decirme como puedo hacer? Seguí las instrucciones sugeridas en esta página.http://www.achartengine.org/content/goodies.html y uso un emulador estándar con api nivel 7. Tengo estos errores:

<code>    04-15 09:08:43.285: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.AverageTemperatureChart.execute
    04-15 09:08:43.325: E/dalvikvm(333): Could not find class 'org.achartengine.model.XYSeries', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.addXYSeries
    04-15 09:08:43.345: E/dalvikvm(333): Could not find class 'org.achartengine.model.XYMultipleSeriesDataset', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildBarDataset
    04-15 09:08:43.387: E/dalvikvm(333): Could not find class 'org.achartengine.renderer.XYMultipleSeriesRenderer', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildBarRenderer
    04-15 09:08:43.395: E/dalvikvm(333): Could not find class 'org.achartengine.model.CategorySeries', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildCategoryDataset
    04-15 09:08:43.425: E/dalvikvm(333): Could not find class 'org.achartengine.renderer.DefaultRenderer', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildCategoryRenderer
    04-15 09:08:43.425: E/dalvikvm(333): Could not find class 'org.achartengine.model.XYMultipleSeriesDataset', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildDataset
    04-15 09:08:43.445: E/dalvikvm(333): Could not find class 'org.achartengine.model.XYMultipleSeriesDataset', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildDateDataset
    04-15 09:08:43.445: E/dalvikvm(333): Could not find class 'org.achartengine.model.MultipleCategorySeries', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildMultipleCategoryDataset
    04-15 09:08:43.485: E/dalvikvm(333): Could not find class 'org.achartengine.renderer.XYMultipleSeriesRenderer', referenced from method org.achartengine.chartdemo.demo.chart.AbstractDemoChart.buildRenderer
    04-15 09:08:43.525: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.AverageCubicTemperatureChart.execute
    04-15 09:08:43.545: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.TrigonometricFunctionsChart.execute
    04-15 09:08:43.555: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.ScatterChart.execute
    04-15 09:08:43.555: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.SalesComparisonChart.execute
    04-15 09:08:43.565: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.ProjectStatusChart.execute
    04-15 09:08:43.576: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.SalesGrowthChart.execute
    04-15 09:08:43.595: E/dalvikvm(333): Could not find class 'org.achartengine.model.XYMultipleSeriesDataset', referenced from method org.achartengine.chartdemo.demo.chart.ProjectStatusBubbleChart.execute
    04-15 09:08:43.606: E/dalvikvm(333): Could not find class 'org.achartengine.model.XYMultipleSeriesDataset', referenced from method org.achartengine.chartdemo.demo.chart.TemperatureChart.execute
    04-15 09:08:43.606: E/dalvikvm(333): Could not find class 'org.achartengine.model.CategorySeries', referenced from method org.achartengine.chartdemo.demo.chart.WeightDialChart.execute
    04-15 09:08:43.615: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.SensorValuesChart.execute
    04-15 09:08:43.615: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.CombinedTemperatureChart.execute
    04-15 09:08:43.626: E/dalvikvm(333): Could not find class '[Lorg.achartengine.chart.PointStyle;', referenced from method org.achartengine.chartdemo.demo.chart.MultipleTemperatureChart.execute
    04-15 09:13:51.145: E/AndroidRuntime(333): Uncaught handler: thread main exiting due to uncaught exception
    04-15 09:13:51.155: E/AndroidRuntime(333): java.lang.NoClassDefFoundError: [Lorg.achartengine.chart.PointStyle;
    04-15 09:13:51.155: E/AndroidRuntime(333):  at org.achartengine.chartdemo.demo.chart.AverageTemperatureChart.execute(AverageTemperatureChart.java:72)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at org.achartengine.chartdemo.demo.ChartDemo.onListItemClick(ChartDemo.java:102)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.app.ListActivity$2.onItemClick(ListActivity.java:312)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.widget.AdapterView.performItemClick(AdapterView.java:284)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.widget.ListView.performItemClick(ListView.java:3285)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:1640)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.os.Handler.handleCallback(Handler.java:587)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.os.Handler.dispatchMessage(Handler.java:92)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.os.Looper.loop(Looper.java:123)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at android.app.ActivityThread.main(ActivityThread.java:4363)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at java.lang.reflect.Method.invokeNative(Native Method)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at java.lang.reflect.Method.invoke(Method.java:521)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
    04-15 09:13:51.155: E/AndroidRuntime(333):  at dalvik.system.NativeStart.main(Native Method)
    04-15 09:13:51.175: E/dalvikvm(333): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
</code>