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org.nlogo.nvm.EngineException: Illegal number format	at org.nlogo.nvm.CommandTask.perform(Task.scala:87)	at org.nlogo.prim.etc._foreach.perform(_foreach.scala:36)	at org.nlogo.nvm.Context.runExclusive(Context.java:119)	at org.nlogo.nvm.ExclusiveJob.run(ExclusiveJob.java:57)	at org.nlogo.nvm.Context.runExclusiveJob(Context.java:162)