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org.xwiki.rendering.RenderingException: Failed to execute renderer
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:291)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:271)
 at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:869)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:831)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:818)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:773)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:765)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:79)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:73)
 at org.xwiki.template.script.TemplateScriptService.render(TemplateScriptService.java:54)
 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$VelMethodImpl.doInvoke(UberspectImpl.java:571)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:217)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
 at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.Template.merge(Template.java:358)
 at org.apache.velocity.Template.merge(Template.java:262)
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:233)
 at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:107)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:174)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:135)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:288)
 at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:288)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:271)
 at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:869)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:831)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:818)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:773)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderNoException(InternalTemplateManager.java:765)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:79)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.renderNoException(DefaultTemplateManager.java:73)
 at org.xwiki.template.script.TemplateScriptService.render(TemplateScriptService.java:54)
 at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
 at java.base/java.lang.reflect.Method.invoke(Method.java:580)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:571)
 at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:554)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:221)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:217)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:331)
 at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:261)
 at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:190)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:190)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.Template.merge(Template.java:358)
 at org.apache.velocity.Template.merge(Template.java:262)
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:233)
 at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:107)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:174)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:135)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:288)
 at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:288)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.render(DefaultAsyncRendererExecutor.java:271)
 at org.xwiki.rendering.async.internal.block.DefaultBlockAsyncRendererExecutor.render(DefaultBlockAsyncRendererExecutor.java:154)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:869)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:831)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.renderFromSkin(InternalTemplateManager.java:811)
 at com.xpn.xwiki.internal.template.InternalTemplateManager.render(InternalTemplateManager.java:797)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:91)
 at com.xpn.xwiki.internal.template.DefaultTemplateManager.render(DefaultTemplateManager.java:85)
 at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:2571)
 at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:180)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:651)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:339)
 at com.xpn.xwiki.web.LegacyActionServlet.service(LegacyActionServlet.java:111)
 at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:723)
 at org.eclipse.jetty.ee11.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1397)
 at org.eclipse.jetty.ee11.servlet.ServletHolder.handle(ServletHolder.java:754)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1668)
 at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:123)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.wysiwyg.filter.ConversionFilter.doFilter(ConversionFilter.java:71)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.container.servlet.filters.internal.SetHTTPHeaderFilter.doFilter(SetHTTPHeaderFilter.java:66)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.resource.servlet.RoutingFilter.doFilter(RoutingFilter.java:135)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:212)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.container.servlet.filters.internal.SafeRedirectFilter.doFilter(SafeRedirectFilter.java:106)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.container.servlet.filters.internal.ResolveRelativeRedirectFilter.doFilter(ResolveRelativeRedirectFilter.java:129)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.container.servlet.filters.internal.SourceURLResolverFilter.doFilter(SourceURLResolverFilter.java:177)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:120)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:208)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.eclipse.jetty.ee11.websocket.servlet.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:199)
 at org.eclipse.jetty.ee11.servlet.FilterHolder.doFilter(FilterHolder.java:205)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1640)
 at org.eclipse.jetty.ee11.servlet.ServletHandler$MappedServlet.handle(ServletHandler.java:1602)
 at org.eclipse.jetty.ee11.servlet.ServletChannel.dispatch(ServletChannel.java:871)
 at org.eclipse.jetty.ee11.servlet.ServletChannel.handle(ServletChannel.java:449)
 at org.eclipse.jetty.ee11.servlet.ServletHandler.handle(ServletHandler.java:469)
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:546)
 at org.eclipse.jetty.ee11.servlet.SessionHandler.handle(SessionHandler.java:763)
 at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1226)
 at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:178)
 at org.eclipse.jetty.server.Server.handle(Server.java:197)
 at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:788)
 at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:420)
 at org.eclipse.jetty.server.internal.HttpConnection$FillableCallback.succeeded(HttpConnection.java:1809)
 at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
 at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:54)
 at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:492)
 at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.epcRunTask(AdaptiveExecutionStrategy.java:428)
 at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:401)
 at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:255)
 at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:204)
 at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:317)
 at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:1009)
 at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1240)
 at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1194)
 at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: org.xwiki.rendering.RenderingException: Failed to evaluate template with id [environment:/skins/flamingo/historyinline.vm]
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:221)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.renderVelocity(TemplateAsyncRenderer.java:174)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:135)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.render(TemplateAsyncRenderer.java:54)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.lambda$syncRender$0(DefaultAsyncRendererExecutor.java:288)
 at com.xpn.xwiki.internal.security.authorization.DefaultAuthorExecutor.call(DefaultAuthorExecutor.java:98)
 at org.xwiki.rendering.async.internal.DefaultAsyncRendererExecutor.syncRender(DefaultAsyncRendererExecutor.java:288)
 ... 145 more
Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with namespace [environment:/skins/flamingo/view.vm]
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:235)
 at com.xpn.xwiki.internal.template.VelocityTemplateEvaluator.evaluateContent(VelocityTemplateEvaluator.java:107)
 at com.xpn.xwiki.internal.template.TemplateAsyncRenderer.evaluateContent(TemplateAsyncRenderer.java:219)
 ... 151 more
Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getAuthor' in  class com.xpn.xwiki.api.RevisionInfo threw exception java.lang.NullPointerException at environment:/skins/flamingo/historyinline.vm[line 164, column 128]
 at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:246)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:704)
 at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:75)
 at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:167)
 at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:368)
 at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:492)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.directive.Foreach.renderBlock(Foreach.java:309)
 at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:279)
 at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:304)
 at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:147)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:190)
 at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:439)
 at org.apache.velocity.Template.merge(Template.java:358)
 at org.apache.velocity.Template.merge(Template.java:262)
 at org.xwiki.velocity.internal.InternalVelocityEngine.evaluate(InternalVelocityEngine.java:233)
 ... 153 more
Caused by: java.lang.NullPointerException