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java.lang.ClassFormatError: Failed to load hudson.slaves.SlaveComputer$SlaveVersion	at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:340)	at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:251)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:249)	at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:114)	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1591)	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)	at hudson.remoting.UserRequest.deserialize(UserRequest.java:184)	at hudson.remoting.UserRequest.perform(UserRequest.java:98)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:326)	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)	at hudson.remoting.Engine$1$1.run(Engine.java:62)	at java.lang.Thread.run(Thread.java:695)