请问大神，下面这个问题怎么解决？
FreeMarker template error: The following has evaluated to null or missing: ==> content.title [in template "jeecms_sys/content/list.html" at line 338, column 71] Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)?? The failing instruction (FTL stack trace): ---------- ==> @text_cut s=content.title?html len=25... [in template "jeecms_sys/content/list.html" at line 338, column 58] #nested [in template "ftl/jeecms/ui/table-column.ftl" in macro "column" at line 15, column 127] #else [in template "ftl/jeecms/ui/table-column.ftl" in macro "column" at line 14, column 1] @p.column code="content.title" [in template "jeecms_sys/content/list.html" at line 331, column 9] #nested row row_index row_has_next [in template "ftl/jeecms/ui/table.ftl" in macro "table" at line 17, column 72] @p.table value=pagination [in template "jeecms_sys/content/list.html" at line 326, column 1] ---------- Java stack trace (for programmers): ---------- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:98) at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:382) at freemarker.core.Expression.evalAndCoerceToString(Expression.java:115) at freemarker.core.StringBuiltins$StringBuiltIn._eval(StringBuiltins.java:87) at freemarker.core.Expression.eval(Expression.java:111) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:129) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.visit(Environment.java:487) at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.IfBlock.accept(IfBlock.java:84) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Macro$Context.runMacro(Macro.java:209) at freemarker.core.Environment.visit(Environment.java:694) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.visit(Environment.java:487) at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visitByHiddingParent(Environment.java:286) at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:193) at freemarker.core.Environment.visitIteratorBlock(Environment.java:509) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:103) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Macro$Context.runMacro(Macro.java:209) at freemarker.core.Environment.visit(Environment.java:694) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.process(Environment.java:243) at freemarker.template.Template.process(Template.java:277) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283) at |
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