Se ha producido un error al procesar la plantilla.
The following has evaluated to null or missing:
==> ImagenCarpeta.getData()?split("/")[3]  [in template "20097#20123#71698" at line 13, column 29]

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Tip: It's the final [] step that caused this error, not those before it.
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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: #assign folderId = ImagenCarpeta.getD...  [in template "20097#20123#71698" at line 13, column 9]
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1<#-- Evitar request undefined al procesar la plantilla para obtener descripcion --> 
2<#if .vars['request']?has_content> 
3    <#assign DLFileEntryLocalService = serviceLocator.findService("com.liferay.document.library.kernel.service.DLFileEntryLocalService")/> 
4    <#assign GroupLocalService = serviceLocator.findService("com.liferay.portal.kernel.service.GroupLocalService")> 
5     
6    <#assign OrderByComparatorFactoryUtil = staticUtil["com.liferay.portal.kernel.util.OrderByComparatorFactoryUtil"]> 
7    <#assign filesOrderBy = OrderByComparatorFactoryUtil.create("DLFileEntry", ["createDate", false])>  
8 
9<div class="container"> 
10    <h2>${Titulo.getData()}</h2> 
11 
12    <#if ImagenCarpeta?has_content > 
13        <#assign folderId = ImagenCarpeta.getData()?split("/")[3]?number/> 
14             
15        <#assign files = DLFileEntryLocalService.getFileEntries(groupId, folderId, -1, -1, filesOrderBy)/> 
16 
17        <#assign multimediaURL = portal.getPathFriendlyURLPublic() + GroupLocalService.getGroup(groupId).getFriendlyURL() + "/multimedia" /> 
18         
19        <#if (files?has_content)> 
20     
21                    <div class="galeriaImagenes"> 
22 
23                        <#list files?reverse as file> 
24                            <#if !file.isInTrash()> 
25                                <#assign urlTitle = file.getTitle() />    
26                                <#assign src = "/documents/${groupId}/${folderId}/${urlTitle}" /> 
27                                 
28                                <#assign class = "" /> 
29                                <#if file.getDescription() != "" > 
30                                    <#assign class = "class=\"show-description\"" /> 
31                                </#if> 
32                                 
33 
34 
35  <figure> 
36    <a href="${src}" data-fslightbox="gallery"><img src="${src}" alt="${file.getDescription()}" /></a> 
37  </figure> 
38 
39 
40 
41 
42 
43 
44                            </#if> 
45                        </#list> 
46      
47            </div> 
48             
49            <div class="boton-volver btn btn-primary mt-3 right"> 
50                <a class="link-volver" href="${multimediaURL}"><i class="fas fa-caret-left"></i> ${languageUtil.format(locale, "back-to-x", "multimedia")}</a> 
51            </div> 
52                 
53         
54        </#if> 
55    </#if> 
56 
57    </div> 
58 
59 
60 
61 
62<script src="/o/institucional-theme/js/fslightbox.js"></script> 
63 
64 
65 
66 
67<#else> 
68    ${Titulo.getData()} 
69</#if>