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java.lang.NullPointerException: 	at hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:95)	at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:112)	at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)	at java.io.ObjectInputStream.readClassDesc(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readObject(Unknown Source)	at java.util.HashSet.readObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)