When trying to sort a PMD report by 'package', below exception occurred:

com.pmease.quickbuild.plugin.report.engine.exception.ColumnNotFoundException: Can't find column 'package' in report 'packages'.
     at com.pmease.quickbuild.plugin.report.engine.datareport.ReportMetaData.getColumn(ReportMetaData.java:156)
     at com.pmease.quickbuild.plugin.report.engine.datareport.DataReport.getColumn(DataReport.java:100)
     at com.pmease.quickbuild.plugin.report.engine.renderer.table.datagrid.DataReportProvider.iterator(DataReportProvider.java:102)
     at org.apache.wicket.markup.repeater.data.DataViewBase$ModelIterator. (DataViewBase.java:109)
     at org.apache.wicket.markup.repeater.data.DataViewBase.getItemModels(DataViewBase.java:76)
     at org.apache.wicket.markup.repeater.AbstractPageableView.getItemModels(AbstractPageableView.java:107)
     at org.apache.wicket.markup.repeater.RefreshingView.onPopulate(RefreshingView.java:94)
     at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:131)
     at org.apache.wicket.markup.repeater.AbstractPageableView.onBeforeRender(AbstractPageableView.java:121)
     at org.apache.wicket.Component.internalBeforeRender(Component.java:1063)
     at org.apache.wicket.Component.beforeRender(Component.java:1099)
     at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1727)
     at org.apache.wicket.Component.onBeforeRender(Component.java:3877)
     at org.apache.wicket.Component.internalBeforeRender(Component.java:1063)
     at org.apache.wicket.Component.beforeRender(Component.java:1099)
     at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1727)
     at org.apache.wicket.Component.onBeforeRender(Component.java:3877)
     at org.apache.wicket.Component.internalBeforeRender(Component.java:1063)
     at org.apache.wicket.Component.beforeRender(Component.java:1099)
     at org.apache.wicket.Component.prepareForRender(Component.java:2232)
     at org.apache.wicket.Component.prepareForRender(Component.java:2269)
     at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget.java:812)
     at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget.java:685)
     at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:593)
     at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
     at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1258)
     at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
     at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
     at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
     at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)
     at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:138)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:596)
     at com.pmease.quickbuild.web.WebServlet.handleWebRequest(WebServlet.java:147)
     at com.pmease.quickbuild.web.WebServlet.service(WebServlet.java:110)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     at com.pmease.quickbuild.web.HttpServiceProvider$1$1.service(HttpServiceProvider.java:86)
     at org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:90)
     at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:111)
     at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:59)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     at org.eclipse.equinox.http.jetty.internal.HttpServerManager$InternalHttpServiceServlet.service(HttpServerManager.java:318)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:380)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
     at org.mortbay.jetty.Server.handle(Server.java:324)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
     at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:540)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:213)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
     at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
     at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)