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

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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:214)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:405)
at id.employee.application.MainApplication.showReport(MainApplication.java:50)
at id.employee.application.MainApplication.main(MainApplication.java:72)

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