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Covid 19 Vaccine for clinically extremely vulnerable children and young people webinar - resources

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An error occurred while processing the template. 
The following has evaluated to null or missing:
==> fileExtension  [in template "20101#20128#91503" at line 27, column 83]

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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: ${fileExtension}  [in template "20101#20128#91503" at line 27, column 81]
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1<#assign dlFileEntry = serviceLocator.findService("com.liferay.document.library.kernel.service.DLFileEntryLocalService")>  
2 
3<#if file.getSiblings()?has_content> 
4<ol class="lbs-downloads"> 
5 
6	<#list file.getSiblings() as cur_file> 
7        <#list cur_file.getData()?split("/") as x>     
8            <#if x?counter ==3> 
9                <#assign groupId = x?number> 
10            </#if> 
11             
12            <#if x?counter ==6> 
13                <#assign uuId = x?keep_before("?")> 
14            </#if> 
15        </#list> 
16        <#if (uuId??) && (groupId??)> 
17            <#assign file = dlFileEntry.getFileEntryByUuidAndGroupId(uuId,groupId) >    <#-- dlFileEntry object - holds more data--> 
18            <#assign fileSizeInMB = (file.getSize()/1000000)?string["0.##"] > <#--will return file size in MB--> 
19            <#assign fileExtension = file.getExtension()> <#--extension--> 
20        </#if> 
21      <li class="lbs-downloads--item"> 
22    		<a href="${cur_file.getData()}" class="lbs-downloads--link"> 
23    			${cur_file.title.getData()} 
24    		</a> 
25        <ul class="lbs-downloads--meta"> 
26    		<li class="lbs-downloads--extension"> 
27    		    <span class="govuk-visually-hidden">Document format:</span> ${fileExtension} 
28    		</li> 
29    		<li class="lbs-downloads--extension"> 
30    		    <span class="govuk-visually-hidden">Document size:</span> ${fileSizeInMB}MB 
31    		</li> 
32    		<li> 
33    		<a href="${cur_file.getData()}" download> 
34    			Download <span class="govuk-visually-hidden">${cur_file.title.getData()}</span> 
35    		</a> 
36    		</li> 
37    		</ul> 
38		</li> 
39	</#list> 
40	</ol> 
41</#if>