While saving the slave node configuration, got below error. Can someone please 
assist?

Stack trace

javax.servlet.ServletException: java.lang.AssertionError: class 
org.jruby.proxy.hudson.slaves.NodeProperty$Proxy3 is missing its descriptor
                at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
                at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
                at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:391)
                at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
                at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
                at 
org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:211)
                at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
                at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
                at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
                at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
                at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
                at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
                at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
                at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:123)
                at 
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:114)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
                at 
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
                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$1.doFilter(ChainedServletFilter.java:87)
                at 
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
                at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
                at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
                at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
                at 
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
                at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
                at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
                at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
                at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
                at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
                at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
                at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
                at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
                at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
                at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
                at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
                at org.eclipse.jetty.server.Server.handle(Server.java:370)
                at 
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
                at 
org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
                at 
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
                at 
org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
                at 
org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
                at 
org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
                at 
org.eclipse.jetty.io.nio.SslConnection.handle(SslConnection.java:196)
                at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
                at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
                at 
winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
                at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
                at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
                at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.AssertionError: class 
org.jruby.proxy.hudson.slaves.NodeProperty$Proxy3 is missing its descriptor
                at jenkins.model.Jenkins.getDescriptorOrDie(Jenkins.java:1183)
                at 
hudson.slaves.NodeProperty.getDescriptor(NodeProperty.java:87)
                at hudson.slaves.NodeProperty.reconfigure(NodeProperty.java:174)
                at hudson.slaves.NodeProperty.reconfigure(NodeProperty.java:80)
                at hudson.util.DescribableList.rebuild(DescribableList.java:171)
                at hudson.model.Node$2.onConvert(Node.java:453)
                at 
org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:539)
                at 
org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
                at 
org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:693)
                at 
org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:81)
                at 
org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:596)
                at 
org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
                at 
org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:396)
                at hudson.model.Descriptor.newInstance(Descriptor.java:568)
                at hudson.model.Node.reconfigure(Node.java:464)
                at hudson.model.Computer.doConfigSubmit(Computer.java:1211)
                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$InstanceFunction.invoke(Function.java:298)
                at 
org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:46)
                at 
org.kohsuke.stapler.Function$InterceptedFunction.invoke(Function.java:399)
                at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
                at 
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
                at 
org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
                at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
                at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
                ... 67 more

Regards, Sudhakar

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