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java.lang.Comparable: 	at java.util.TreeMap.put(TreeMap.java:542)	at java.util.TreeSet.add(TreeSet.java:238)	at com.esotericsoftware.kryo.serialize.CollectionSerializer.readObjectData(CollectionSerializer.java:113)	at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:566)	at de.javakaffee.kryoserializers.UnmodifiableCollectionsSerializer.readObjectData(UnmodifiableCollectionsSerializer.java:84)	at com.esotericsoftware.kryo.serialize.FieldSerializer.readObjectData(FieldSerializer.java:220)