The following has evaluated to null or missing:
==> data._named[folderName] [in template "Source (57612428-b47d-4d56-920c-4d07aeb0792b)" at line 9, column 38]
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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 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: #if data._named[folderName]._children?? [in template "Source (57612428-b47d-4d56-920c-4d07aeb0792b)" at line 9, column 33]
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- Failed at: #if data._named[folderName]._children?? [in template "Source (57612428-b47d-4d56-920c-4d07aeb0792b)" at line 9, column 33]
- Failed at: #if data._named[folderName]._children?? [in template "Source (57612428-b47d-4d56-920c-4d07aeb0792b)" at line 9, column 33]
