freemarker.core.invalidreferenceexception: the following has evaluated to null or missing:
==> articles [in template "68895" at line 23, column 28]
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tip: if the failing expression is known to be legally refer to something that's null or missing, either specify a default value like 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 parenthesis: (myoptionalvar.foo)!mydefault, (myoptionalvar.foo)??
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ftl stack trace ("~" means nesting-related):
- failed at: #list articles as article [in template "68895" at line 23, column 21]
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