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

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This exception has no message.
java.lang.ClassCastException:
at javax.swing.table.DefaultTableModel.justifyRows(DefaultTableModel.java:238)
at javax.swing.table.DefaultTableModel.setDataVector(DefaultTableModel.java:194)
at javax.swing.table.DefaultTableModel.(DefaultTableModel.java:131)
at javax.swing.JTable.(JTable.java:403)
at undefined.NetNegotiator.makeTable(NetNegotiator.java:187)
at undefined.NetNegotiator.(NetNegotiator.java:246)
at undefined.NetNegotiator.main(NetNegotiator.java:349)

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