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java.lang.NullPointerException: 	at net.sf.jasperreports.engine.JRPropertiesMap.readObject(JRPropertiesMap.java:185)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readArray(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readObject(Unknown Source)	at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:88)	at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:64)	at erpproject.Sample.jButton1ActionPerformed(Sample.java:107)	at erpproject.Sample.access$000(Sample.java:32)	at erpproject.Sample$1.actionPerformed(Sample.java:57)	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at javax.swing.JComponent.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$000(Unknown Source)	at java.awt.EventQueue$1.run(Unknown Source)	at java.awt.EventQueue$1.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(UnknownSource)	at java.security.AccessControlContext$1.doIntersectionPrivilege(UnknownSource)	at java.awt.EventQueue$2.run(Unknown Source)	at java.awt.EventQueue$2.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(UnknownSource)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)