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  FreeMarker template error (HTML_DEBUG mode; use RETHROW in production!)

  
  The following has evaluated to null or missing:
  ==> content.summary  [in template "catarc_pc/template/ditan_list.template.html" at line 34, column 51]
  
  ----
  Tip: It's the step after the last dot that caused this error, not those before it.
  ----
  Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
  ----
  
  ----
  FTL stack trace ("~" means nesting-related):
  	- Failed at: ${content.summary}  [in template "catarc_pc/template/ditan_list.template.html" at line 34, column 49]
  	- Reached through: @cms_content level="Root" sort="Recen...  [in template "catarc_pc/template/ditan_list.template.html" at line 27, column 13]
  ----
  
  Java stack trace (for programmers):
  ----
  freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
  	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
  	at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:481)
  	at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:401)
  	at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:370)
  	at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:104)
  	at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
  	at freemarker.core.Environment.visit(Environment.java:371)
  	at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321)
  	at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271)
  	at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244)
  	at freemarker.core.Environment.visitIteratorBlock(Environment.java:645)
  	at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108)
  	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
  	at freemarker.core.Environment.visit(Environment.java:371)
  	at freemarker.core.Environment$NestedElementTemplateDirectiveBody.render(Environment.java:3423)
  	at com.chestnut.common.staticize.tag.AbstractTag.onTagEnd(AbstractTag.java:96)
  	at com.chestnut.common.staticize.tag.AbstractTag.execute(AbstractTag.java:65)
  	at freemarker.core.Environment.visit(Environment.java:452)
  	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:102)
  	at freemarker.core.Environment.visit(Environment.java:335)
  	at freemarker.core.Environment.visit(Environment.java:341)
  	at freemarker.core.Environment.process(Environment.java:314)
  	at com.chestnut.common.staticize.StaticizeService.process(StaticizeService.java:108)
  	at com.chestnut.contentcore.publish.staticize.CatalogStaticizeType.doCatalogStaticize(CatalogStaticizeType.java:174)
  	at com.chestnut.contentcore.publish.staticize.CatalogStaticizeType.catalogStaticize(CatalogStaticizeType.java:100)
  	at com.chestnut.contentcore.publish.staticize.CatalogStaticizeType.catalogStaticize(CatalogStaticizeType.java:91)
  	at com.chestnut.contentcore.publish.staticize.CatalogStaticizeType.staticize(CatalogStaticizeType.java:83)
  	at com.chestnut.contentcore.publish.strategies.ThreadPoolPublishStrategy.lambda$publish$0(ThreadPoolPublishStrategy.java:59)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  	at java.base/java.lang.Thread.run(Thread.java:842)