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

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This exception has no message.
java.lang.NullPointerException:
at javax.swing.DefaultComboBoxModel.(Unknown Source)
at javax.swing.JComboBox.(Unknown Source)
at undefined.MortgageFrame5.(MortgageFrame5.java:45)
at undefined.MortgageFrame5.main(MortgageFrame5.java:199)

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