An error occurred while processing the template.
The following has evaluated to null or missing:
==> serviceLocator  [in template "20115#20151#ARTICLE-DISPLAY" at line 4, column 44]

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Tip: If the failing expression is known to be 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 multiPageArticleService = ser...  [in template "20115#20151#ARTICLE-DISPLAY" at line 4, column 9]
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1<#if SectionTitle.getSiblings()?has_content> 
2    <div class="multi-part-article"> 
3     
4    	<#assign multiPageArticleService = serviceLocator.findService("uk.gov.camden.navigation.service.MultiPageArticleService") /> 
5    	<#assign journalArticleId = .vars['reserved-article-id'].data/> 
6    	<#assign instanceIds = multiPageArticleService.getSectionInstanceIds(groupId,journalArticleId) > 
7     
8        <#list SectionTitle.getSiblings() as cur_SectionTitle> 
9         
10        	<#assign instanceId = instanceIds[cur_SectionTitle?index] > 
11         
12            <div id="multi_part_section_${cur_SectionTitle?index}" data-instance-id="${instanceId}" class="multi_part_section ${(cur_SectionTitle?index gt 0)?then('visually-hidden','')}"> 
13                 
14                <article> 
15                    <h2 class="section_title">${cur_SectionTitle.getData()}</h2> 
16                    <div class="sharethis-inline-share-buttons"></div> 
17                    <div class="section_content">${cur_SectionTitle.SectionContent.getData()}</div> 
18                </article> 
19                <nav class="pagination"> 
20                    <ul class="pagination__list"> 
21                     
22                        <#if cur_SectionTitle?index gt 0> 
23                        	<#assign previousInstanceId = instanceIds[cur_SectionTitle?index-1] > 
24                            <li class="pagination__item pagination__item--previous"> 
25                                <a class="pagination__link multi_part_nav_previous" data-instance-id="${previousInstanceId}"> 
26                                    <strong class="pagination__label">Previous<span class="visually-hidden"> page</span></strong> 
27                                    <span class="pagination__meta-group"> 
28                                        <span class="pagination__icon icon icon-ui-arrow-left"></span> 
29                                        <span class="pagination__meta"> 
30                                            ${SectionTitle.getSiblings()[cur_SectionTitle?index-1].getData()} 
31                                        </span> 
32                                    </span> 
33                                </a> 
34                            </li> 
35                        </#if> 
36                         
37                        <#if cur_SectionTitle?has_next> 
38                        	<#assign nextInstanceId = instanceIds[cur_SectionTitle?index+1] > 
39                            <li class="pagination__item pagination__item--next"> 
40                                <a class="pagination__link multi_part_nav_next" data-instance-id="${nextInstanceId}"> 
41                                    <strong class="pagination__label">Next<span class="visually-hidden"> page</span></strong> 
42                                    <span class="pagination__meta-group"> 
43                                        <span class="pagination__meta"> 
44                                            ${SectionTitle.getSiblings()[cur_SectionTitle?index+1].getData()} 
45                                        </span> 
46                                        <span class="pagination__icon icon icon-ui-arrow-right"></span> 
47                                    </span> 
48                                </a> 
49                            </li> 
50                        </#if> 
51                    </ul> 
52                </nav> 
53            </div> 
54        </#list> 
55     
56    </div> 
57</#if>