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Failed to dynamically deploy this plugin
hudson.util.IOException2: Failed to dynamically deploy this plugin at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1317) at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1116) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:104) at java.lang.Thread.run(Thread.java:724)Caused by: hudson.util.IOException2: Failed to install ruby-runtime plugin at hudson.PluginManager.dynamicLoad(PluginManager.java:438) at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1313) ... 6 moreCaused by: hudson.util.IOException2: Failed to initialize at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:370) at hudson.PluginManager.dynamicLoad(PluginManager.java:429) ... 7 moreCaused by: java.lang.NullPointerException at java.lang.Class.isAssignableFrom(Native Method) at org.jenkinsci.jruby.JavaProxyConverter.canConvert(JavaProxyConverter.java:43) at com.thoughtworks.xstream.core.DefaultConverterLookup.registerConverter(DefaultConverterLookup.java:72) at com.thoughtworks.xstream.XStream.registerConverter(XStream.java:1294) at com.thoughtworks.xstream.XStream.registerConverter(XStream.java:1289) at org.jenkinsci.jruby.JRubyXStream.register(JRubyXStream.java:26) at ruby.RubyRuntimePlugin.initRubyXStreams(RubyRuntimePlugin.java:46) at ruby.RubyRuntimePlugin.start(RubyRuntimePlugin.java:28) at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:378) at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:367) ... 8 more