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

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This exception has no message.
java.lang.NullPointerException:
at com.borland.jbcl.view.GridView.setOpaque(GridView.java:570)
at javax.swing.JScrollPane.(Unknown Source)
at javax.swing.JScrollPane.(Unknown Source)
at com.borland.jbcl.view.GridView.(GridView.java:47)
at com.borland.jbcl.control.GridControl.(GridControl.java:44)
at DebtorsUtilities.ReceiptsByWeek.(ReceiptsByWeek.java:45)
at DebtorsUtilities.InputReceiptDates3.button1_actionPerformed(InputReceiptDates3.java:146)

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