The following has evaluated to null or missing:
==> spDescription.htDescription  [in template "20099#20125#3788123" at line 1, column 3]

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Tip: It's the step after the last dot 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: ${spDescription.htDescription.getData()}  [in template "20099#20125#3788123" at line 1, column 1]
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1${spDescription.htDescription.getData()} 

2<iframe 

3    title="${CopyOftfDisplayTitle.getData()}" 

4    width="${spIframeWidth.tfIframeWidth.getData()}" 

5    height="${spIframeHeight.tfIframeHeight.getData()}" 

6    src="${spIframeURL.tfIframeURL.getData()}"> 

7</iframe>