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java.lang.IllegalArgumentException: not a primitive field	at java.lang.reflect.Field.setFField(Field.java)	at java.lang.reflect.Field.setFloat(Field.java:746)	at java.io.ObjectInputStream.readFieldValues(ObjectInputStream.java:1092)	at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:455)	at java.io.ObjectInputStream.readObjectForClass(ObjectInputStream.java:1347)	at java.io.ObjectInputStream.readHierarchy(ObjectInputStream.java:1244)	at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1833)	at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:762)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1981)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1938)