java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.io.ObjectInputStream$PeekInputStream.read(ObjectInputStream.java:2265)
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2278)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2749)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:779)
at java.io.ObjectInputStream.(ObjectInputStream.java:279)
at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.(ContextClassLoaderObjectInputStream.java:53)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:214)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:405)
at id.hans.employee.application.Mainclass.showReport(Mainclass.java:62)
at id.hans.employee.application.Mainclass.main(Mainclass.java:85)

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