FreeMarker template error (HTML_DEBUG mode; use RETHROW in production!)
The following has evaluated to null or missing:
==> Bootstrap3NavHome [in template "about.html" at line 32, column 9]
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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: @Bootstrap3NavHome [in template "about.html" at line 32, column 7]
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Java stack trace (for programmers):
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freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
at freemarker.core.Environment.visit(Environment.java:344)
at freemarker.core.Environment.visit(Environment.java:350)
at freemarker.core.Environment.process(Environment.java:323)
at freemarker.template.Template.process(Template.java:383)
at org.marker.mushroom.template.SendDataToView.process(SendDataToView.java:145)
at org.marker.mushroom.core.WebAPP.start(WebAPP.java:187)
at org.marker.mushroom.servlet.CmsDispatcherServlet.progress(CmsDispatcherServlet.java:50)
at org.marker.mushroom.servlet.CmsDispatcherServlet.doGet(CmsDispatcherServlet.java:77)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:110)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:610)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:392)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:321)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:266)
at org.marker.mushroom.filter.SystemCoreFilter.doFilter(SystemCoreFilter.java:253)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:138)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:88)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:90)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:733)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1776)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:975)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:493)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
at java.base/java.lang.Thread.run(Thread.java:840)