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the following has evaluated to null or missing:
==> articles.articletitle  [in template "tpl/2017/04/08/2127761887152128//displaynews.html" at line 49, column 11]
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tip: it's the step after the last dot 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. (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: ${articles.articletitle}  [in template "tpl/2017/04/08/2127761887152128//displaynews.html" at line 49, column 9]
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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.evalutil.coercemodeltotextualcommon(evalutil.java:451)
	at freemarker.core.evalutil.coercemodeltostringormarkup(evalutil.java:374)
	at freemarker.core.dollarvariable.calculateinterpolatedstringormarkup(dollarvariable.java:96)
	at freemarker.core.dollarvariable.accept(dollarvariable.java:59)
	at freemarker.core.environment.visit(environment.java:327)
	at freemarker.core.environment.visit(environment.java:333)
	at freemarker.core.environment.visit(environment.java:333)
	at freemarker.core.environment.process(environment.java:306)
	at freemarker.ext.servlet.freemarkerservlet.processenvironment(freemarkerservlet.java:946)
	at freemarker.ext.servlet.freemarkerservlet.process(freemarkerservlet.java:910)
	at freemarker.ext.servlet.freemarkerservlet.doget(freemarkerservlet.java:769)
	at javax.servlet.http.httpservlet.service(httpservlet.java:622)
	at javax.servlet.http.httpservlet.service(httpservlet.java:729)
	at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:292)
	at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:207)
	at org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)
	at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:240)
	at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:207)
	at com.kenfor.iyong.web.util.filter.notallowedtotunfilesfilter.dofilter(notallowedtotunfilesfilter.java:154)
	at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:240)
	at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:207)
	at com.kenfor.iyong.web.util.filter.invalidxssfilter.dofilter(invalidxssfilter.java:40)
	at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:240)
	at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:207)
	at org.springframework.web.filter.characterencodingfilter.dofilterinternal(characterencodingfilter.java:121)
	at org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:107)
	at org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:240)
	at org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:207)
	at org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:212)
	at org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:106)
	at org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:502)
	at com.orangefunction.tomcat.redissessions.redissessionhandlervalve.invoke(redissessionhandlervalve.java:26)
	at org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:141)
	at org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:79)
	at org.apache.catalina.valves.abstractaccesslogvalve.invoke(abstractaccesslogvalve.java:616)
	at org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:88)
	at org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:528)
	at org.apache.coyote.ajp.abstractajpprocessor.process(abstractajpprocessor.java:873)
	at org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:687)
	at org.apache.tomcat.util.net.nioendpoint$socketprocessor.dorun(nioendpoint.java:1520)
	at org.apache.tomcat.util.net.nioendpoint$socketprocessor.run(nioendpoint.java:1476)
	at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1142)
	at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:617)
	at org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)
	at java.lang.thread.run(thread.java:745)