java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
java.util.ConcurrentModificationException:
at java.util.LinkedHashMap$LinkedHashIterator.nextNode(Unknown Source)
at java.util.LinkedHashMap$LinkedKeyIterator.next(Unknown Source)
at java.util.HashSet.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at Scraper.htmlunit.getPage(htmlunit.java:82)
at Scraper.TranslateOxford.(TranslateOxford.java:46)
at Scraper.oxfordToCsv.(oxfordToCsv.java:24)
at Scraper.main.main(main.java:26)

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