java.lang.ClassCastException: This exception has no message.

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This exception has no message.
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 undefined.SoftwareHouse.addEmployee(SoftwareHouse.java:36)
at undefined.Application.run(Application.java:44)
at undefined.Main.main(Main.java:15)

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