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java.lang.NullPointerException: 	at undefined.PaymentCalculatorWeek5.button1ActionPerformed(PaymentCalculatorWeek5.java:201)	at undefined.PaymentCalculatorWeek5.access$000(PaymentCalculatorWeek5.java:19)	at undefined.PaymentCalculatorWeek5$1.actionPerformed(PaymentCalculatorWeek5.java:64)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)	at java.awt.Component.processMouseEvent(Component.java:6373)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)	at java.awt.Component.processEvent(Component.java:6138)	at java.awt.Container.processEvent(Container.java:2085)	at java.awt.Component.dispatchEventImpl(Component.java:4735)	at java.awt.Container.dispatchEventImpl(Container.java:2143)	at java.awt.Component.dispatchEvent(Component.java:4565)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4621)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4282)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)	at java.awt.Container.dispatchEventImpl(Container.java:2129)	at java.awt.Window.dispatchEventImpl(Window.java:2478)	at java.awt.Component.dispatchEvent(Component.java:4565)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:679)	at java.awt.EventQueue.access$000(EventQueue.java:85)	at java.awt.EventQueue$1.run(EventQueue.java:638)	at java.awt.EventQueue$1.run(EventQueue.java:636)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)	at java.awt.EventQueue$2.run(EventQueue.java:652)	at java.awt.EventQueue$2.run(EventQueue.java:650)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:649)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)