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java.lang.StackOverflowError: null	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1479)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)	at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)	at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)