Error evaluating cell Sheet1!E8
Caused by:

org.zkoss.poi.ss.formula.eval.NotImplementedException: Error evaluating cell Sheet1!E8
	at org.zkoss.poi.ss.formula.WorkbookEvaluator.addExceptionInfo(WorkbookEvaluator.java:385)
	at org.zkoss.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:326)
	at org.zkoss.poi.ss.formula.WorkbookEvaluator.evaluate(WorkbookEvaluator.java:255)
	at org.zkoss.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluateFormulaCellValue(XSSFFormulaEvaluator.java:266)
	at org.zkoss.poi.xssf.usermodel.XSSFFormulaEvaluator.evaluate(XSSFFormulaEvaluator.java:119)
	at org.zkoss.zss.model.impl.BookHelper.evaluate(BookHelper.java:471)
	at org.zkoss.zss.model.impl.BookHelper.getFormatText(BookHelper.java:1013)
	at org.zkoss.zss.model.impl.RangeImpl.getFormatText(RangeImpl.java:271)
	at org.zkoss.zss.ui.impl.Utils.getFormatText(Utils.java:915)
	at org.zkoss.zss.ui.impl.CellFormatHelper.getHtmlStyle(CellFormatHelper.java:89)
	at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getCellAttr(Spreadsheet.java:3034)
	at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getRangeAttrs(Spreadsheet.java:2880)
	at org.zkoss.zss.ui.Spreadsheet.renderProperties(Spreadsheet.java:1648)
	at org.zkoss.zk.ui.AbstractComponent.redraw(AbstractComponent.java:1805)
	at org.zkoss.zk.ui.sys.HtmlPageRenders.outPageContent(HtmlPageRenders.java:609)
	at org.zkoss.zul.impl.PageRenderer.renderDesktop(PageRenderer.java:98)
	at org.zkoss.zul.impl.PageRenderer.render(PageRenderer.java:56)
	at org.zkoss.zk.ui.impl.PageImpl.redraw(PageImpl.java:854)
	at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:490)
	at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:316)
	at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)
	at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:135)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:326)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: org.zkoss.poi.ss.formula.eval.NotImplementedException: BESSELI
	at org.zkoss.poi.ss.formula.atp.AnalysisToolPak$NotImplemented.evaluate(AnalysisToolPak.java:40)
	at org.zkoss.poi.ss.formula.UserDefinedFunction.evaluate(UserDefinedFunction.java:65)
	at org.zkoss.poi.ss.formula.OperationEvaluatorFactory.evaluate(OperationEvaluatorFactory.java:129)
	at org.zkoss.poi.ss.formula.WorkbookEvaluator.evaluateFormula(WorkbookEvaluator.java:539)
	at org.zkoss.poi.ss.formula.WorkbookEvaluator.evaluateAny(WorkbookEvaluator.java:316)
	... 37 more