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java.util.ConcurrentModificationException at java.util.Hashtable$Enumerator.next(Hashtable.java:1031) at org.pentaho.di.core.variables.Variables.initializeVariablesFrom(Variables.java:126) at org.pentaho.di.base.AbstractMeta.initializeVariablesFrom(AbstractMeta.java:1227) at org.pentaho.di.job.JobMeta.<init>(JobMeta.java:170) at org.pentaho.di.kitchen.Kitchen.main(Kitchen.java:271)