ConcurrentModificationException

[Mr.Wang]

Hi~
We found this error when we read kafka data using storm:
java.util.ConcurrentModificationException         at 
java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719)     
    at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:742)   
      at java.util.AbstractCollection.addAll(AbstractCollection.java:343)May I 
ask this to fix the program by ourselves? What code do we need to modify?Thanks!