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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:200)	at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:376)	at laporanbelajar.LaporanBelajar.showReport(LaporanBelajar.java:55)	at laporanbelajar.LaporanBelajar.main(LaporanBelajar.java:80)