Expression has thrown an unchecked exception; see the cause exception.
The blamed expression:
==> internalUrl(Catalog.logo)  [in template "tiancheng_website/template/detail.template.html" at line 57, column 111]

----
FTL stack trace ("~" means nesting-related):
	- Failed at: ${internalUrl(Catalog.logo)}  [in template "tiancheng_website/template/detail.template.html" at line 57, column 109]
----

Java stack trace (for programmers):
----
freemarker.core._MiscTemplateException: [... Exception message was already printed; see it above ...]
	at freemarker.core.Expression.eval(Expression.java:106)
	at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:104)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
	at freemarker.core.Environment.visit(Environment.java:335)
	at freemarker.core.Environment.visit(Environment.java:341)
	at freemarker.core.Environment.process(Environment.java:314)
	at com.ruoyi.common.staticize.StaticizeService.process(StaticizeService.java:78)
	at com.ruoyi.contentcore.service.impl.PublishServiceImpl.doContentStaticize(PublishServiceImpl.java:618)
	at com.ruoyi.contentcore.service.impl.PublishServiceImpl.contentStaticize(PublishServiceImpl.java:583)
	at com.ruoyi.contentcore.service.impl.PublishServiceImpl$6.run0(PublishServiceImpl.java:562)
	at com.ruoyi.common.async.AsyncTask.run(AsyncTask.java:90)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:842)
Caused by: java.lang.NullPointerException: Cannot invoke "freemarker.template.SimpleScalar.getAsString()" because "simpleScalar" is null
	at com.ruoyi.contentcore.template.func.InternalUrlFunction.exec0(InternalUrlFunction.java:46)
	at com.ruoyi.common.staticize.func.AbstractFunc.exec(AbstractFunc.java:13)
	at freemarker.core.MethodCall._eval(MethodCall.java:62)
	at freemarker.core.Expression.eval(Expression.java:101)
	... 13 more