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java.lang.NullPointerException: 	at hudson.model.Descriptor$NewInstanceBindInterceptor.instantiate(Descriptor.java:641)	at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:749)	at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:83)	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:674)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:478)	at org.kohsuke.stapler.RequestImpl.injectSetters(RequestImpl.java:827)	at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:777)	at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:83)	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:674)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:478)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:474)	at hudson.model.Descriptor.newInstance(Descriptor.java:590)	at hudson.model.Descriptor$NewInstanceBindInterceptor.onConvert(Descriptor.java:661)	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:617)	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:712)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:478)	at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:771)	at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:83)	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:674)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:478)	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:474)	at hudson.model.Descriptor.newInstance(Descriptor.java:590)	at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:1043)	at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:1005)	at hudson.util.DescribableList.rebuildHetero(DescribableList.java:208)	at jenkins.model.GlobalCloudConfiguration.configure(GlobalCloudConfiguration.java:24)	at jenkins.model.Jenkins.configureDescriptor(Jenkins.java:3415)	at jenkins.model.Jenkins.doConfigSubmit(Jenkins.java:3378)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:324)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:167)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:100)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:124)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)	at org.kohsuke.stapler.Stapler.service(Stapler.java:238)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:80)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	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: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 jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)	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$1.doFilter(ChainedServletFilter.java:87)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)	at org.eclipse.jetty.server.Server.handle(Server.java:499)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)