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java.lang.NullPointerException: 	at hudson.model.AbstractItem.getRootDir(AbstractItem.java:160)	at hudson.model.Items.getConfigFile(Items.java:236)	at hudson.model.AbstractItem.getConfigFile(AbstractItem.java:459)	at hudson.model.AbstractItem.save(AbstractItem.java:454)	at hudson.model.Job.save(Job.java:159)	at hudson.model.AbstractProject.save(AbstractProject.java:279)	at hudson.diagnosis.OldDataMonitor.doDiscard(OldDataMonitor.java:275)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:297)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:160)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:95)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:684)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:777)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:239)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:684)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:777)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:586)	at org.kohsuke.stapler.Stapler.service(Stapler.java:217)	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 hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)	at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:206)	at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:179)	at net.bull.javamelody.PluginMonitoringFilter.doFilter(PluginMonitoringFilter.java:86)	at org.jvnet.hudson.plugins.monitoring.HudsonMonitoringFilter.doFilter(HudsonMonitoringFilter.java:84)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:99)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	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:118)	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:142)	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$1.doFilter(ChainedServletFilter.java:87)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:47)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:724)