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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)