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java.lang.NullPointerException: 	at java.io.ObjectInputStream$PeekInputStream.read(ObjectInputStream.java:2283)	at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2296)	at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2767)	at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:798)	at java.io.ObjectInputStream.(ObjectInputStream.java:298)	at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.(ContextClassLoaderObjectInputStream.java:53)	at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:210)	at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:376)	at flightMgm.jButton1ActionPerformed(flightMgm.java:74)	at flightMgm.access$000(flightMgm.java:13)	at flightMgm$1.actionPerformed(flightMgm.java:41)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)	at javax.swing.AbstractButton$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:6505)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)	at java.awt.Component.processEvent(Component.java:6270)	at java.awt.Container.processEvent(Container.java:2229)	at java.awt.Component.dispatchEventImpl(Component.java:4861)	at java.awt.Container.dispatchEventImpl(Container.java:2287)	at java.awt.Component.dispatchEvent(Component.java:4687)	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:4687)	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)