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java.lang.NullPointerException: 	at com.register.file.CreateFile.showYears(CreateFile.java:140)	at com.register.file.CreateFile.createYear(CreateFile.java:30)	at com.register.main.Menu.registers(Menu.java:30)	at com.register.main.Menu.menu(Menu.java:132)	at com.register.main.Main.main(Main.java:14)