The following has evaluated to null or missing:
==> articleService  [in template "775047#775088#880178" at line 6, column 35]

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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: ${articleService.getContentByClassPK(...  [in template "775047#775088#880178" at line 6, column 33]
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1<section id="members2" class="section"> 

2            <div class="container"> 

3                <div class="row gx-5" style="row-gap: 50px;"> 

4                  <#if entries?has_content> 

5	<#list entries as curEntry> 

6				${articleService.getContentByClassPK(curEntry.classPK?number, "39651")} 

7	</#list> 

8</#if> 

9                   

10 

11                </div> 

12            </div> 

13    </div> 

14    </section>