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Exception in thread "main" com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException Serialization trace: classes (sun.misc.Launcher$AppClassLoader) classLoader (scala.reflect.runtime.JavaMirrors$JavaMirror) $outer
java.util.ConcurrentModificationException: Exception in thread "main" com.esotericsoftware.kryo.KryoException: java.util.ConcurrentModificationException
Serialization trace:
classes (sun.misc.Launcher$AppClassLoader)
classLoader (scala.reflect.runtime.JavaMirrors$JavaMirror)
$outer (scala.reflect.runtime.JavaMirrors$JavaMirror$$anon$1)
currentOwner (scala.reflect.internal.Trees$TreeTypeSubstituter)
EmptyTreeTypeSubstituter (scala.reflect.runtime.JavaUniverse)
$outer (scala.reflect.api.TypeTags$PredefTypeTag)
t (TagTest$A)	at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:101)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:518)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)