Erro ao tentar abrir um relatorio a partir de uma classe

No meu programa está dando o seguinte erro:

java.io.StreamCorruptedException&#58; invalid stream header
        at java.io.ObjectInputStream.readStreamHeader&#40;ObjectInputStream.java&#58;753&#41;
        at java.io.ObjectInputStream.&lt;init&gt;&#40;ObjectInputStream.java&#58;268&#41;
        at net.sf.jasperreports.engine.util.JRLoader.loadObject&#40;JRLoader.java&#58;87&#41;
        at net.sf.jasperreports.engine.util.JRLoader.loadObject&#40;JRLoader.java&#58;64&#41;
        at net.sf.jasperreports.view.JRViewer.loadReport&#40;JRViewer.java&#58;1206&#41;
        at net.sf.jasperreports.view.JRViewer.&lt;init&gt;&#40;JRViewer.java&#58;154&#41;
        at net.sf.jasperreports.view.JasperViewer.&lt;init&gt;&#40;JasperViewer.java&#58;118&#41;
        at net.sf.jasperreports.view.JasperViewer.viewReport&#40;JasperViewer.java&#58;298&#41;
        &#40;...&#41;

me ajudem… please!

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