java.lang.ClassCastException
        at org.eclipse.birt.chart.reportitem.ChartReportItemQueryImpl.setModelObject(ChartReportItemQueryImpl.java:81)
        at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder$QueryBuilderVisitor.visitExtendedItem(ReportQueryBuilder.java:337)
        at org.eclipse.birt.report.engine.ir.ExtendedItemDesign.accept(ExtendedItemDesign.java:30)
        at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder$QueryBuilderVisitor.buildQuery(ReportQueryBuilder.java:193)
        at org.eclipse.birt.report.engine.data.dte.ReportQueryBuilder.build(ReportQueryBuilder.java:114)
        at org.eclipse.birt.report.engine.data.dte.DteDataEngine.prepare(DteDataEngine.java:162)
        at org.eclipse.birt.report.engine.executor.ReportExecutor.execute(ReportExecutor.java:107)
        at org.eclipse.birt.report.engine.executor.ReportExecutor.execute(ReportExecutor.java:89)
        at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.run(RunAndRenderTask.java:175)
        at org.eclipse.birt.report.services.ReportEngineService.runAndRenderReport(Unknown Source)
        at org.eclipse.birt.report.viewer.aggregation.layout.EngineFragment.doService(Unknown Source)
        at org.eclipse.birt.report.viewer.aggregation.BaseFragment.service(Unknown Source)
        at org.eclipse.birt.report.viewer.servlet.ViewerServlet.doGet(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:534)