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java.lang.NullPointerException: 	at CarCompany.addCarToRent(CarCompany.java:161)	at CarCompany.actionPerformed(CarCompany.java:244)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)	at java.awt.Component.processMouseEvent(Component.java:6504)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)	at java.awt.Component.processEvent(Component.java:6269)	at java.awt.Container.processEvent(Container.java:2229)	at java.awt.Component.dispatchEventImpl(Component.java:4860)	at java.awt.Container.dispatchEventImpl(Container.java:2287)	at java.awt.Component.dispatchEvent(Component.java:4686)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)	at java.awt.Container.dispatchEventImpl(Container.java:2273)	at java.awt.Window.dispatchEventImpl(Window.java:2713)	at java.awt.Component.dispatchEvent(Component.java:4686)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)	at java.awt.EventQueue.access$000(EventQueue.java:101)	at java.awt.EventQueue$3.run(EventQueue.java:666)	at java.awt.EventQueue$3.run(EventQueue.java:664)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)	at java.awt.EventQueue$4.run(EventQueue.java:680)	at java.awt.EventQueue$4.run(EventQueue.java:678)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)