The following has evaluated to null or missing:
==> request.getParameter("articleId")  [in template "20097#20123#336086" at line 2, column 46]

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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)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: articleId = request.getParameter("art...  [in template "20097#20123#336086" at line 2, column 34]
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1<#assign 

2				 articleId = request.getParameter("articleId") 

3				 groupId = getterUtil.getLong(request.getParameter("groupId")) 

4				 /> 

5		<@liferay_journal["journal-article"] 

6									 articleId=articleId 

7									 ddmTemplateKey="336077" 

8									 groupId=groupId 

9									 />