java.lang.ClassCastException: java.lang.String

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java.lang.ClassCastException: java.lang.String
at javax.swing.table.DefaultTableModel.justifyRows(DefaultTableModel.java:242)
at javax.swing.table.DefaultTableModel.setDataVector(DefaultTableModel.java:198)
at javax.swing.table.DefaultTableModel.(DefaultTableModel.java:133)

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