org.eclipse.amp.agf.chart Couldn't generate chart

org.eclipse.birt.chart.exception.ChartException
at org.eclipse.birt.chart.factory.Generator.build(Generator.java:1076)
at org.eclipse.birt.chart.factory.Generator.build(Generator.java:856)
at org.eclipse.amp.agf.chart.ChartEditPart.regenerateChart(ChartEditPart.java:395)
at org.eclipse.amp.agf.chart.ChartEditPart$5.run(ChartEditPart.java:337)
at org.eclipse.amp.agf.chart.ChartEditPart.refresh(ChartEditPart.java:339)
at org.eclipse.amp.agf.chart.ChartEditPart$ChartModelListener.update(ChartEditPart.java:190)
at org.eclipse.amp.axf.view.SWTAsyncModelListener.doUpdate(SWTAsyncModelListener.java:137)
at org.eclipse.amp.axf.view.SWTAsyncModelListener.access$1(SWTAsyncModelListener.java:134)
at org.eclipse.amp.axf.view.SWTAsyncModelListener$ReportingRunner.run(SWTAsyncModelListener.java:48)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2629)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2593)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2427)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:670)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:663)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
Caused by: java.lang.NullPointerException
at org.eclipse.birt.chart.render.BaseRenderer.instances(BaseRenderer.java:2186)
at org.eclipse.birt.chart.factory.Generator.build(Generator.java:1060)
... 32 more

11/10/2010 11:36:49 AM org.eclipse.birt.chart.util.PluginSettings getRenderer
SEVERE: (ECLIPSE-ENV) Could not find series renderer impl for org.eclipse.birt.chart.model.type.impl.LineSeriesImpl