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java.lang.ClassCastException: 	at java.util.TreeMap.compare(TreeMap.java:1081)	at java.util.TreeMap.put(TreeMap.java:459)	at java.util.TreeSet.add(TreeSet.java:205)	at SoftwareHouse.addEmployee(SoftwareHouse.java:36)	at Application.run(Application.java:44)	at Main.main(Main.java:15)