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java.lang.NullPointerException: 	at org.apache.coyote.ajp.AjpMessage.appendString(AjpMessage.java:242)	at org.apache.coyote.ajp.AjpMessage.appendBytes(AjpMessage.java:178)	at org.apache.coyote.ajp.AjpAprProcessor.prepareResponse(AjpAprProcessor.java:962)	at org.apache.coyote.ajp.AjpAprProcessor.action(AjpAprProcessor.java:486)	at org.apache.coyote.Response.action(Response.java:183)	at org.apache.coyote.Response.sendHeaders(Response.java:379)	at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)	at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:273)	at org.apache.catalina.connector.CoyoteOutputStream.close(CoyoteOutputStream.java:104)	at com.jcraft.jzlib.DeflaterOutputStream.close(DeflaterOutputStream.java:122)	at org.kohsuke.stapler.compression.FilterServletOutputStream.close(FilterServletOutputStream.java:36)	at java.io.FilterOutputStream.close(FilterOutputStream.java:154)	at sun.nio.cs.StreamEncoder$CharsetSE.implClose(StreamEncoder.java:454)	at sun.nio.cs.StreamEncoder.close(StreamEncoder.java:183)	at java.io.OutputStreamWriter.close(OutputStreamWriter.java:282)	at java.io.BufferedWriter.close(BufferedWriter.java:259)	at org.dom4j.io.XMLWriter.close(XMLWriter.java:286)	at org.kohsuke.stapler.jelly.HTMLWriterOutput.close(HTMLWriterOutput.java:70)	at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:56)	at org.kohsuke.stapler.jelly.JellyClassTearOff.serveIndexJelly(JellyClassTearOff.java:112)	at org.kohsuke.stapler.jelly.JellyFacet.handleIndexRequest(JellyFacet.java:127)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:716)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:841)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:794)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:841)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:630)	at org.kohsuke.stapler.Stapler.service(Stapler.java:224)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)	at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:135)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)	at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:438)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)	at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:421)	at org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProtocol.java:378)	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)	at java.lang.Thread.run(Thread.java:738)