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java.lang.NullPointerException: 	at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:84)	at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:115)	at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:265)	at org.thymeleaf.spring4.expression.SpelVariableExpressionEvaluator.evaluate(SpelVariableExpressionEvaluator.java:139)	at org.thymeleaf.standard.expression.SelectionVariableExpression.executeSelectionVariable(SelectionVariableExpression.java:146)	at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:80)	at org.thymeleaf.standard.expression.Expression.execute(Expression.java:103)	at org.thymeleaf.standard.expression.Expression.execute(Expression.java:133)	at org.thymeleaf.standard.expression.Expression.execute(Expression.java:120)	at org.thymeleaf.standard.fragment.StandardFragmentProcessor.resolveFragmentParameters(StandardFragmentProcessor.java:154)	at org.thymeleaf.standard.fragment.StandardFragmentProcessor.computeStandardFragmentSpec(StandardFragmentProcessor.java:98)	at org.thymeleaf.standard.processor.attr.AbstractStandardFragmentHandlingAttrProcessor.computeFragment(AbstractStandardFragmentHandlingAttrProcessor.java:68)	at org.thymeleaf.processor.attr.AbstractFragmentHandlingAttrProcessor.processAttribute(AbstractFragmentHandlingAttrProcessor.java:63)	at org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87)	at org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212)	at org.thymeleaf.dom.Node.applyNextProcessor(Node.java:1017)	at org.thymeleaf.dom.Node.processNode(Node.java:972)	at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)	at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)	at org.thymeleaf.dom.Node.processNode(Node.java:990)	at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)	at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)	at org.thymeleaf.dom.Node.processNode(Node.java:990)	at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)	at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)	at org.thymeleaf.dom.Node.processNode(Node.java:990)	at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)	at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)	at org.thymeleaf.dom.Node.processNode(Node.java:990)	at org.thymeleaf.dom.Document.process(Document.java:93)	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1155)	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1060)	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1011)	at org.thymeleaf.spring4.view.ThymeleafView.renderFragment(ThymeleafView.java:335)	at org.thymeleaf.spring4.view.ThymeleafView.render(ThymeleafView.java:190)	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)	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:305)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)