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java.lang.NullPointerException: 	at hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(	at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(	at Source)	at Source)	at Source)	at Source)	at Source)	at java.util.HashSet.readObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)