Error number 4001 in 4: Error while parsing velocity page swissneuro:Content.Vergangene_Tagungen
Wrapped Exception: Failed to evaluate content with id [swissneuro:Content.Vergangene_Tagungen]
com.xpn.xwiki.XWikiException: Error number 4001 in 4: Error while parsing velocity page swissneuro:Content.Vergangene_Tagungen
Wrapped Exception: Failed to evaluate content with id [swissneuro:Content.Vergangene_Tagungen]
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:124)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.render(XWikiVelocityRenderer.java:96)
	at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:279)
	at com.xpn.xwiki.render.DefaultXWikiRenderingEngine.renderText(DefaultXWikiRenderingEngine.java:215)
	at com.celements.rendering.RenderCommand.renderTemplatePath(RenderCommand.java:176)
	at com.celements.rendering.RenderCommand.lambda$renderCelementsDocument$1(RenderCommand.java:145)
	at com.celements.common.lambda.LambdaExceptionUtil.lambda$rethrowSupplier$4(LambdaExceptionUtil.java:116)
	at com.celements.model.context.Contextualiser$ContextModifier.execute(Contextualiser.java:77)
	at com.celements.model.context.Contextualiser.lambda$execute$9(Contextualiser.java:140)
	at com.celements.model.context.Contextualiser.lambda$execute$10(Contextualiser.java:140)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:141)
	at com.celements.rendering.RenderCommand.renderCelementsDocument(RenderCommand.java:145)
	at com.celements.rendering.RenderCommand.renderCelementsDocument(RenderCommand.java:130)
	at com.celements.rendering.RenderCommand.renderCelementsCell(RenderCommand.java:90)
	at com.celements.cells.div.CellRenderStrategy.renderEmptyChildren(CellRenderStrategy.java:58)
	at com.celements.cells.RenderingEngine.renderSubCells(RenderingEngine.java:122)
	at com.celements.cells.RenderingEngine.lambda$renderCell$0(RenderingEngine.java:98)
	at com.celements.model.context.Contextualiser.lambda$execute$6(Contextualiser.java:126)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:141)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:125)
	at com.celements.cells.RenderingEngine.renderCell(RenderingEngine.java:96)
	at com.celements.cells.RenderingEngine.renderSubCells(RenderingEngine.java:117)
	at com.celements.cells.RenderingEngine.lambda$renderCell$0(RenderingEngine.java:98)
	at com.celements.model.context.Contextualiser.lambda$execute$6(Contextualiser.java:126)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:141)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:125)
	at com.celements.cells.RenderingEngine.renderCell(RenderingEngine.java:96)
	at com.celements.cells.RenderingEngine.renderSubCells(RenderingEngine.java:117)
	at com.celements.cells.RenderingEngine.lambda$renderCell$0(RenderingEngine.java:98)
	at com.celements.model.context.Contextualiser.lambda$execute$6(Contextualiser.java:126)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:141)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:125)
	at com.celements.cells.RenderingEngine.renderCell(RenderingEngine.java:96)
	at com.celements.cells.RenderingEngine.renderSubCells(RenderingEngine.java:117)
	at com.celements.cells.RenderingEngine.lambda$renderCell$0(RenderingEngine.java:98)
	at com.celements.model.context.Contextualiser.lambda$execute$6(Contextualiser.java:126)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:141)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:125)
	at com.celements.cells.RenderingEngine.renderCell(RenderingEngine.java:96)
	at com.celements.cells.RenderingEngine.renderSubCells(RenderingEngine.java:117)
	at com.celements.cells.RenderingEngine.renderLayout(RenderingEngine.java:76)
	at com.celements.layout.DefaultLayoutService.lambda$renderLayoutLocal$6(DefaultLayoutService.java:258)
	at com.celements.layout.DefaultLayoutService.lambda$renderLocal$8(DefaultLayoutService.java:279)
	at com.celements.model.context.Contextualiser.lambda$execute$6(Contextualiser.java:126)
	at com.celements.model.context.Contextualiser$ContextModifier.execute(Contextualiser.java:77)
	at com.celements.model.context.Contextualiser.lambda$execute$9(Contextualiser.java:140)
	at com.celements.model.context.Contextualiser.lambda$execute$10(Contextualiser.java:140)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:141)
	at com.celements.model.context.Contextualiser.execute(Contextualiser.java:125)
	at com.celements.layout.DefaultLayoutService.renderLocal(DefaultLayoutService.java:279)
	at com.celements.layout.DefaultLayoutService.renderLayoutLocal(DefaultLayoutService.java:257)
	at com.celements.layout.DefaultLayoutService.renderLayout(DefaultLayoutService.java:208)
	at com.celements.layout.LayoutScriptService.renderPageLayout(LayoutScriptService.java:80)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:332)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.apache.velocity.runtime.directive.Parse.render(Parse.java:260)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:196)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:161)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:119)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1297)
	at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1209)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1184)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:957)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:332)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:196)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:161)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:119)
	at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1249)
	at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:168)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:216)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:136)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:197)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at com.xpn.xwiki.web.ActionFilterFBHack.doFilter(ActionFilterFBHack.java:92)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at com.celements.init.ExecutionContextFilter.doFilter(ExecutionContextFilter.java:48)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.apache.catalina.filters.CorsFilter.handleNonCORS(CorsFilter.java:334)
	at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:161)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:142)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:88)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)
	at org.apache.catalina.valves.HealthCheckValve.invoke(HealthCheckValve.java:91)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:643)
	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:763)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:935)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1831)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:973)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:491)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with id [swissneuro:Content.Vergangene_Tagungen]
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:205)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:161)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:119)
	... 150 more
Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'reverseList' in  class com.xpn.xwiki.api.Util threw exception java.lang.NullPointerException: Cannot invoke "java.util.List.size()" because "list" is null at swissneuro:Content.Vergangene_Tagungen[line 3, column 27]
	at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:337)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:284)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:493)
	at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:196)
	... 152 more
Caused by: java.lang.NullPointerException: Cannot invoke "java.util.List.size()" because "list" is null
	at java.base/java.util.Collections.reverse(Collections.java:384)
	at com.xpn.xwiki.api.Util.reverseList(Util.java:243)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)
	... 158 more