Directive has thrown an unchecked exception; see the cause exception.

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FTL stack trace ("~" means nesting-related):
	- Failed at: @cms_article articleId="${Article.id}"  [in template "pc/template/default/content/show.template.html" at line 73, column 9]
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Java stack trace (for programmers):
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freemarker.core._MiscTemplateException: [... Exception message was already printed; see it above ...]
	at freemarker.core.Environment.visit(Environment.java:462)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:102)
	at freemarker.core.Environment.visit(Environment.java:335)
	at freemarker.core.Environment.visit(Environment.java:341)
	at freemarker.core.Environment.process(Environment.java:314)
	at cn.org.gzsk.framework.staticize.StaticizeService.process(StaticizeService.java:80)
	at cn.org.gzsk.cms.publish.staticize.ArticleStaticizeType.doArticleStaticize(ArticleStaticizeType.java:106)
	at cn.org.gzsk.cms.publish.staticize.ArticleStaticizeType.articleStaticize(ArticleStaticizeType.java:68)
	at cn.org.gzsk.cms.publish.staticize.ArticleStaticizeType.staticize(ArticleStaticizeType.java:60)
	at cn.org.gzsk.cms.publish.strategies.ThreadPoolPublishStrategy.lambda$publish$0(ThreadPoolPublishStrategy.java:41)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:842)
Caused by: java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:208)
	at java.base/java.util.ImmutableCollections$MapN.<init>(ImmutableCollections.java:1186)
	at java.base/java.util.Map.of(Map.java:1373)
	at cn.org.gzsk.cms.publish.template.tag.CmsArticleTag.execute0(CmsArticleTag.java:95)
	at cn.org.gzsk.framework.staticize.tag.AbstractTag.execute(AbstractTag.java:46)
	at freemarker.core.Environment.visit(Environment.java:452)
	... 12 more