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java.lang.NullPointerException: 	at gui.BuyTicket.displayDate(BuyTicket.java:131)	at gui.BuyTicket.createContentPane(BuyTicket.java:87)	at gui.BuyTicket.createAndShowGUI(BuyTicket.java:115)	at gui.HomePage$2.mouseClicked(HomePage.java:151)	at java.awt.Component.processMouseEvent(Unknown Source)