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java.lang.RuntimeException: java.lang.ClassNotFoundException: org.jruby.util.collections.WeakHashSet	at org.kohsuke.asm5.ClassWriter.getCommonSuperClass(ClassWriter.java:1684)	at org.kohsuke.asm5.ClassWriter.getMergedType(ClassWriter.java:1654)	at org.kohsuke.asm5.Frame.merge(Frame.java:1426)	at org.kohsuke.asm5.Frame.merge(Frame.java:1325)	at org.kohsuke.asm5.MethodWriter.visitMaxs(MethodWriter.java:1475)	at org.kohsuke.asm5.tree.MethodNode.accept(MethodNode.java:833)	at org.kohsuke.asm5.commons.JSRInlinerAdapter.visitEnd(JSRInlinerAdapter.java:187)	at org.kohsuke.asm5.MethodVisitor.visitEnd(MethodVisitor.java:877)	at org.kohsuke.asm5.ClassReader.readMethod(ClassReader.java:1021)	at org.kohsuke.asm5.ClassReader.accept(ClassReader.java:693)	at org.kohsuke.asm5.ClassReader.accept(ClassReader.java:506)	at org.jenkinsci.bytecode.Transformer.transform(Transformer.java:76)	at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:800)	at jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1310)	at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1366)	at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)	at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at org.jenkinsci.jruby.RubyClassConverter.(RubyClassConverter.java:12)	at org.jenkinsci.jruby.JRubyXStream.register(JRubyXStream.java:25)	at ruby.RubyRuntimePlugin.initRubyXStreams(RubyRuntimePlugin.java:44)	at ruby.RubyRuntimePlugin.start(RubyRuntimePlugin.java:28)	at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:449)	at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:438)	at hudson.PluginManager.dynamicLoad(PluginManager.java:478)	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1324)	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1126)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)	at java.lang.Thread.run(Thread.java:745)