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FreeMarkertemplateerror(DEBUGmode;useRETHROWinproduction!):Thefollowinghasevaluatedtonullormissing:==>columnManage[intemplate"neirong.html"atline118,column23]----Tip:Ifthefailingexpressionisknowntobelegallyrefertosomethingthat"snullormissing,eitherspecifyadefaultvaluelikemyOptionalVar!myDefault,oruse<#ifmyOptionalVar??>when-present<#else>when-missing.(Theseonlycoverthelaststepoftheexpression;tocoverthewholeexpression,useparenthesis:(myOptionalVar.foo)!myDefault,(myOptionalVar.foo)??--------FTLstacktrace("~"meansnesting-related):-Failedat:${columnManage.colName!}[intemplate"neirong.html"atline118,column21]----Javastacktrace(forprogrammers):----freemarker.core.InvalidReferenceException:[...Exceptionmessagewasalreadyprinted;seeitabove...]atfreemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:116)atfreemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:60)atfreemarker.core.UnexpectedTypeException.(UnexpectedTypeException.java:40)atfreemarker.core.NonHashException.(NonHashException.java:46)atfreemarker.core.Dot._eval(Dot.java:45)atfreemarker.core.Expression.eval(Expression.java:78)atfreemarker.core.DefaultToExpression._eval(DefaultToExpression.java:80)atfreemarker.core.Expression.eval(Expression.java:78)atfreemarker.core.Expression.evalAndCoerceToString(Expression.java:82)atfreemarker.core.DollarVariable.accept(DollarVariable.java:40)atfreemarker.core.Environment.visit(Environment.java:312)atfreemarker.core.MixedContent.accept(MixedContent.java:62)atfreemarker.core.Environment.visit(Environment.java:312)atfreemarker.core.Environment.process(Environment.java:290)atfreemarker.template.Template.process(Template.java:312)atcom.hxzk.hisiweb4.artecreate.action.TemplatePreviewSingle.contentPageMake(TemplatePreviewSingle.java:548)atcom.hxzk.hisiweb4.pagemake.timer.Pagemake.colPageMake(Pagemake.java:155)atcom.hxzk.hisiweb4.pagemake.timer.Pagemake.getChildColumns(Pagemake.java:198)atcom.hxzk.hisiweb4.pagemake.timer.Pagemake.getChildColumns(Pagemake.java:208)atcom.hxzk.hisiweb4.pagemake.timer.Pagemake.run(Pagemake.java:98)atjava.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)atjava.util.concurrent.FutureTask.run(FutureTask.java:262)atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)atjava.lang.Thread.run(Thread.java:745)