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java.lang.NullPointerException: 	at purchasing.purchaseOrderLogIn.okButonActionPerformed(purchaseOrderLogIn.java:165)	at purchasing.purchaseOrderLogIn.access$000(purchaseOrderLogIn.java:17)	at purchasing.purchaseOrderLogIn$1.actionPerformed(purchaseOrderLogIn.java:53)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)	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:6533)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6298)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4889)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)	at java.awt.Container.dispatchEventImpl(Container.java:2280)	at java.awt.Window.dispatchEventImpl(Window.java:2746)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)