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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)	at java.util.HashMap$ValueIterator.next(HashMap.java:822)	at org.apache.commons.vfs.cache.SoftRefFilesCache.clear(SoftRefFilesCache.java:197)	at org.apache.commons.vfs.impl.DefaultFileSystemManager.closeFileSystem(DefaultFileSystemManager.java:925)	at org.pentaho.di.job.entries.unzip.JobEntryUnZip.unzipFile(JobEntryUnZip.java:801)	at org.pentaho.di.job.entries.unzip.JobEntryUnZip.processOneFile(JobEntryUnZip.java:547)	at org.pentaho.di.job.entries.unzip.JobEntryUnZip.execute(JobEntryUnZip.java:489)	at org.pentaho.di.job.Job.execute(Job.java:589)	at org.pentaho.di.job.Job.execute(Job.java:728)	at org.pentaho.di.job.Job.execute(Job.java:728)	at org.pentaho.di.job.Job.execute(Job.java:443)	at org.pentaho.di.job.Job.run(Job.java:363)