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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)	at java.util.AbstractList$Itr.next(AbstractList.java:343)	at org.pentaho.di.trans.step.BaseStep.markStop(BaseStep.java:2712)	at org.pentaho.di.trans.step.RunThread.run(RunThread.java:120)	at java.lang.Thread.run(Thread.java:662)