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