Expression (language) is undefined on line 12, column 70 in common/page_start.ftl. The problematic instruction: ---------- ==> if-else [on line 12, column 65 in common/page_start.ftl] in include "/common/page_start.ftl" [on line 10, column 9 in error.ftl] ---------- Java backtrace for programmers: ---------- freemarker.core.InvalidReferenceException: Expression (language) is undefined on line 12, column 70 in common/page_start.ftl. at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124) at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:121) at freemarker.core.IfBlock.accept(IfBlock.java:80) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.Environment.include(Environment.java:1482) at freemarker.core.Include.accept(Include.java:169) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.MixedContent.accept(MixedContent.java:92) at freemarker.core.Environment.visit(Environment.java:209) at freemarker.core.Environment.process(Environment.java:189) at freemarker.template.Template.process(Template.java:237) at be.smals.kmehr.presentation.TemplateEngine.getTemplate(TemplateEngine.java:86) at be.smals.kmehr.presentation.Controller.processRequest(Controller.java:178) at be.smals.kmehr.presentation.DataServlet.doPost(DataServlet.java:157) at be.smals.kmehr.presentation.DataServlet.doGet(DataServlet.java:72) at javax.servlet.http.HttpServlet.service(HttpServlet.java:503) at javax.servlet.http.HttpServlet.service(HttpServlet.java:590) at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117) at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53) at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59) at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50) at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68) at io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.server.handlers.MetricsHandler.handleRequest(MetricsHandler.java:64) at io.undertow.servlet.core.MetricsChainHandler.handleRequest(MetricsChainHandler.java:59) at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:275) at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:79) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:134) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:131) at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1551) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1551) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1551) at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1551) at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:255) at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:79) at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:100) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387) at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:852) at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377) at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280) at java.lang.Thread.run(Thread.java:748)