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

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java.lang.NullPointerException:
at java.io.ObjectInputStream$PeekInputStream.read(Unknown Source)
at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.(Unknown Source)
at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.(ContextClassLoaderObjectInputStream.java:53)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:200)
at Util.ReportUtils.openReport(ReportUtils.java:35)
at Telas.TRelPedido.btnGerarActionPerformed(TRelPedido.java:232)
at Telas.TRelPedido.access$200(TRelPedido.java:18)
at Telas.TRelPedido$3.actionPerformed(TRelPedido.java:92)

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