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java.lang.UnsupportedOperationException: 	at java.util.Collections$UnmodifiableCollection$1.remove(Collections.java:1012)	at java.util.AbstractMap$2$1.remove(AbstractMap.java:364)	at com.google.common.collect.Iterators$8.remove(Iterators.java:816)	at com.google.common.collect.Iterators.removeAll(Iterators.java:194)	at com.google.common.collect.Iterables.removeAll(Iterables.java:145)	at com.nirima.jenkins.repo.project.ProjectBuildList.getChildren(ProjectBuildList.java:83)	at com.nirima.jenkins.bridge.BridgeRepositoryDirectory.getChildren(BridgeRepositoryDirectory.java:52)	at com.nirima.jenkins.webdav.impl.methods.Head.generateDirectoryListing(Head.java:117)	at com.nirima.jenkins.webdav.impl.methods.Head.invoke(Head.java:82)	at com.nirima.jenkins.webdav.impl.methods.MethodBase.invoke(MethodBase.java:67)	at com.nirima.jenkins.RepositoryPlugin.serveRequest(RepositoryPlugin.java:120)	at com.nirima.jenkins.RepositoryPlugin.doDynamic(RepositoryPlugin.java:104)	at sun.reflect.GeneratedMethodAccessor837.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)	at org.kohsuke.stapler.MetaClass$11.dispatch(MetaClass.java:363)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:488)	at org.kohsuke.stapler.Stapler.service(Stapler.java:162)	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:95)	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:98)	at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98)	at com.marvelution.hudson.plugins.apiv2.servlet.filter.HudsonAPIV2ServletFilter.doFilter(HudsonAPIV2ServletFilter.java:115)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)	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:47)	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 org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)	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:173)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:63)	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:66)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:465)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:396)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:619)