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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)