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java.lang.NullPointerException: 	at java.lang.String.compareTo(String.java:743)	at java.lang.String.compareTo(String.java:792)	at java.util.Arrays.mergeSort(Arrays.java:1124)	at java.util.Arrays.mergeSort(Arrays.java:1132)	at java.util.Arrays.mergeSort(Arrays.java:1131)	at java.util.Arrays.mergeSort(Arrays.java:1131)	at java.util.Arrays.mergeSort(Arrays.java:1131)	at java.util.Arrays.sort(Arrays.java:1074)	at undefined.EmployeeList.printEmployeesInOrder(EmployeeList.java:198)	at undefined.FactorySystem.main(FactorySystem.java:57)