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$FreeMarker template error:
The following has evaluated to null or missing:
==> event['cancelled_flag']  [in template "templates/web/event-details.ftl" at line 94, column 61]

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

The failing instruction (FTL stack trace):
----------
==> #if event["cancelled_flag"] == "Y"  [in template "templates/web/event-details.ftl" at line 94, column 56]
    #nested  [in template "templates/web/layout/defaultLayout.ftl" in macro "default" at line 203, column 9]
    @layout.default  [in template "templates/web/event-details.ftl" at line 5, column 1]
----------

Java stack trace (for programmers):
----------
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:98)
	at freemarker.core.EvalUtil.compare(EvalUtil.java:230)
	at freemarker.core.EvalUtil.compare(EvalUtil.java:148)
	at freemarker.core.ComparisonExpression.evalToBoolean(ComparisonExpression.java:103)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:84)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visitByHiddingParent(Environment.java:286)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:86)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visitByHiddingParent(Environment.java:286)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:86)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Environment.visit(Environment.java:487)
	at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Macro$Context.runMacro(Macro.java:209)
	at freemarker.core.Environment.visit(Environment.java:694)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Environment.process(Environment.java:243)
	at freemarker.template.Template.process(Template.java:277)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233)
	at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267)
	at org.craftercms.engine.view.UserAgentAwareCrafterPageView.renderActualView(UserAgentAwareCrafterPageView.java:33)
	at org.craftercms.engine.view.CrafterPageView.renderMergedOutputModel(CrafterPageView.java:232)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1217)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.craftercms.engine.servlet.filter.SiteContextResolvingFilter.doFilter(SiteContextResolvingFilter.java:46)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.craftercms.commons.http.RequestContextBindingFilter.doFilter(RequestContextBindingFilter.java:78)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.craftercms.engine.servlet.filter.ExceptionHandlingFilter.doFilter(ExceptionHandlingFilter.java:56)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:165)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:451)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1201)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

Show error

$FreeMarker template error:
The following has evaluated to null or missing:
==> event.event_type  [in template "templates/web/event-details.ftl" at line 125, column 39]

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

The failing instruction (FTL stack trace):
----------
==> #if event?? && event.event_type.id?? ...  [in template "templates/web/event-details.ftl" at line 125, column 22]
    #nested  [in template "templates/web/layout/defaultLayout.ftl" in macro "default" at line 203, column 9]
    @layout.default  [in template "templates/web/event-details.ftl" at line 5, column 1]
----------

Java stack trace (for programmers):
----------
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:98)
	at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:41)
	at freemarker.core.UnexpectedTypeException.(UnexpectedTypeException.java:24)
	at freemarker.core.Dot._eval(Dot.java:81)
	at freemarker.core.Expression.eval(Expression.java:111)
	at freemarker.core.ExistsExpression._eval(ExistsExpression.java:81)
	at freemarker.core.Expression.eval(Expression.java:111)
	at freemarker.core.Expression.evalToBoolean(Expression.java:143)
	at freemarker.core.AndExpression.evalToBoolean(AndExpression.java:68)
	at freemarker.core.AndExpression.evalToBoolean(AndExpression.java:68)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:84)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visitByHiddingParent(Environment.java:286)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:86)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visitByHiddingParent(Environment.java:286)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:86)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Environment.visit(Environment.java:487)
	at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Macro$Context.runMacro(Macro.java:209)
	at freemarker.core.Environment.visit(Environment.java:694)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Environment.process(Environment.java:243)
	at freemarker.template.Template.process(Template.java:277)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233)
	at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267)
	at org.craftercms.engine.view.UserAgentAwareCrafterPageView.renderActualView(UserAgentAwareCrafterPageView.java:33)
	at org.craftercms.engine.view.CrafterPageView.renderMergedOutputModel(CrafterPageView.java:232)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:267)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1217)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1005)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:952)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.craftercms.engine.servlet.filter.SiteContextResolvingFilter.doFilter(SiteContextResolvingFilter.java:46)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.craftercms.commons.http.RequestContextBindingFilter.doFilter(RequestContextBindingFilter.java:78)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.craftercms.engine.servlet.filter.ExceptionHandlingFilter.doFilter(ExceptionHandlingFilter.java:56)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:165)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:451)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1201)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)