Find a UMCG Researcher

An error occurred while processing the template.
The following has evaluated to null or missing:
==> umcg_library  [in template "20101#20128#218164" at line 3, column 3]

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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: @umcg_library.hero_research type="" c...  [in template "20101#20128#218164" at line 3, column 1]
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1<#if umcg_library_path??><#import umcg_library_path as umcg_library /></#if> 
2 
3<@umcg_library.hero_research 
4    type='' 
5        classes='hero-research--theme-${Theme.getData()}' 
6    title=Banner.BannerTitle.getData() 
7    subtitle=Banner.BannerText.getData() 
8    category=SectionLabel.getData() 
9    show_image=getterUtil.getBoolean(ShowBannerImage.getData()) 
10    show_home_link=getterUtil.getBoolean(ShowHomeLink.getData()) 
11    show_section_link=getterUtil.getBoolean(ShowSectionLink.getData()) 
12    file_id=Banner.BannerImage.getAttribute("fileEntryId")> 
13    <img 
14        alt="${(Banner.BannerImage.getAttribute('alt'))!''}" 
15        src="${(Banner.BannerImage.getData())!''}" 
16    /> 
17</@umcg_library.hero_research> 
18<#if ((Introduction.getData())!'')?has_content> 
19    <div class="container-fluid"> 
20        <@umcg_library.wrapper cols='col-12 col-lg-9 col-xl-8'> 
21              <@umcg_library.text_block text='${Introduction.getData()}'/> 
22        </@umcg_library.wrapper> 
23    </div> 
24</#if> 

Nested Applications