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java.lang.NullPointerException: 	at com.pyxis.greenhopper.charts.timetracking.HourBurndown.getHeader(HourBurndown.java:321)	at com.pyxis.greenhopper.charts.timetracking.HourBurndown.getCSVFile(HourBurndown.java:163)	at com.pyxis.greenhopper.jira.boards.ChartBoard.getChartReport(ChartBoard.java:181)	at com.pyxis.greenhopper.jira.actions.ChartReportAction.doShowChartReport(ChartReportAction.java:22)	at sun.reflect.GeneratedMethodAccessor4243.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:61)	at webwork.util.InjectionUtils.invoke(InjectionUtils.java:52)	at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:417)	at webwork.action.ActionSupport.execute(ActionSupport.java:146)	at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:64)	at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:141)	at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:181)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)