https://www.[ERROR: The following has evaluated to null or missing:
==> site_host  [in template "sitemap.txt" at line 1, column 15]

----
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)??
----

----
FTL stack trace ("~" means nesting-related):
	- Failed at: ${site_host}  [in template "sitemap.txt" at line 1, column 13]
----]