The following has evaluated to null or missing:
==> committee.optionsMap[committee.getData()]  [in template "20097#20123#349725" at line 1, 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 meetingCommittee = committee...  [in template "20097#20123#349725" at line 1, column 1]
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1<#assign meetingCommittee = committee.optionsMap[committee.getData()] > 

2<#assign dateInMilliseconds = date.getData()?datetime("yyyy-MM-dd")?long > 

3<#assign timeInMilliseconds = (timeHours.getData()?number * 3600000 + timeMinutes.getData()?number * 60000) > 

4<#assign dateAndTimeInMilliseconds = dateInMilliseconds + timeInMilliseconds > 

5 

6<div class="page-header"> 

7		<h1 class="main-page-title">${meetingCommittee}</h1> 

8</div> 

9 

10<h3 class="text-white mt-5"><span class="sr-only">Scheduled for </span>${dateAndTimeInMilliseconds?number_to_date?string["EEEE, d MMMM yyyy 'at' h:mm a"]}</h3>