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java.util.ConcurrentModificationException at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:953) at java.util.LinkedList$ListItr.next(LinkedList.java:886) at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:86) at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:152) at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:158) at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:171) at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:167) at org.pentaho.di.job.Job.execute(Job.java:556) at org.pentaho.di.job.Job.execute(Job.java:667) at org.pentaho.di.job.Job.execute(Job.java:667) at org.pentaho.di.job.Job.execute(Job.java:393) at org.pentaho.di.job.Job.run(Job.java:313)