How do I open my account for GAP

An error occurred while processing the template.
The following has evaluated to null or missing:
==> testimonial  [in template "20099#20125#null" at line 9, column 107]

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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 testimonial_date_Data = gette...  [in template "20099#20125#null" at line 9, column 53]
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1<dl><dt class="text-capitalize">Question</dt><dd><#if (question.getData())??> 
2	${question.getData()} 
3</#if></dd><dt class="text-capitalize">Answer</dt><dd><#if (answer.getData())??> 
4	${answer.getData()} 
5</#if></dd><dt class="text-capitalize">Media</dt><dd><a href="${media.getData()}"> 
6	${languageUtil.format(locale, "download-x", "Media", false)} 
7</a></dd><dt class="text-capitalize">Name</dt><dd><#if (testimonial.name.getData())??> 
8	${testimonial.name.getData()} 
9</#if></dd><dt class="text-capitalize">Date</dt><dd><#assign testimonial_date_Data = getterUtil.getString(testimonial.date.getData())> 
10 
11<#if validator.isNotNull(testimonial_date_Data)> 
12	<#assign testimonial_date_DateObj = dateUtil.parseDate("yyyy-MM-dd", testimonial_date_Data, locale)> 
13 
14	${dateUtil.getDate(testimonial_date_DateObj, "dd MMM yyyy - HH:mm:ss", locale)} 
15</#if></dd><dt class="text-capitalize">Description</dt><dd><#if (testimonial.description.getData())??> 
16	${testimonial.description.getData()} 
17</#if></dd><dt class="text-capitalize">Profile</dt><dd><a href="${testimonial.profile.getData()}"> 
18	${languageUtil.format(locale, "download-x", "Profile", false)} 
19</a></dd></dl>