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java.lang.NullPointerException: 	at edu.iu.uis.eden.util.Utilities$PrioritySorter.compare(Utilities.java:174)	at edu.iu.uis.eden.util.Utilities$RouteLogActionRequestSorter.compare(Utilities.java:208)	at java.util.Arrays.mergeSort(Unknown Source)	at java.util.Arrays.sort(Unknown Source)	at java.util.Collections.sort(Unknown Source)	at edu.iu.uis.eden.util.Utilities$RouteLogActionRequestSorter.compare(Utilities.java:191)	at java.util.Arrays.mergeSort(Unknown Source)	at java.util.Arrays.sort(Unknown Source)	at java.util.Collections.sort(Unknown Source)	at edu.iu.uis.eden.engine.simulation.SimulationEngine.process(SimulationEngine.java:129)