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

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This exception has no message.
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java.util.ConcurrentModificationException:
at java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1231)
at java.util.ArrayList$SubList.size(ArrayList.java:1040)
at week04.MergeSort.mergesort(MergeSort.java:17)
at week04.test.MergeSortTest.testMergesortUnsortedList(MergeSortTest.java:42)

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