Erro: iReport + Netbeans

try {
                    Connection con = HibernateUtility.getSession().connection();

                    String sql = "SELECT "
                            + "pagamentos.numero_cheque AS pagamentos_numero_cheque, "
                            + "pagamentos.data_pagamento AS pagamentos_data_pagamento, "
                            + "pagamentos.valor AS pagamentos_valor, "
                            + "pagamentos.valor_desconto AS pagamentos_valor_desconto, "
                            + "pagamentos.valor_juros AS pagamentos_valor_juros, "
                            + "extratos.data AS extratos_data, "
                            + "extratos.valor AS extratos_valor, "
                            + "extratos.tipo_operacao AS extratos_tipo_operacao, "
                            + "fornecedores.nome AS fornecedores_nome, "
                            + "bancos.nome AS bancos_nome, "
                            + "extratos.historico AS extratos_historico, "
                            + "contas.descricao AS contas_descricao, "
                            + "contas.agencia AS contas_agencia, "
                            + "contas.digito_agencia AS contas_digito_agencia, "
                            + "contas.digito_conta AS contas_digito_conta "
                            + "FROM "
                            + "carajas.fornecedores fornecedores INNER JOIN carajas.pagamentos pagamentos ON fornecedores.id = pagamentos.id_fornecedor "
                            + "INNER JOIN carajas.extratos extratos ON pagamentos.id_extrato = extratos.id "
                            + "INNER JOIN carajas.contas contas ON pagamentos.id_conta = contas.id "
                            + "AND contas.id = extratos.id_conta "
                            + "INNER JOIN carajas.bancos bancos ON contas.id_banco = bancos.id "
                            + "WHERE "
                            + "pagamentos.data_pagamento between '" + Functions.formatDate(dpDataIni.getDate(), "yyyy/MM/dd")
                            + "' and '" + Functions.formatDate(dpDataFim.getDate(), "yyyy/MM/dd") + "' "
                            + "and pagamentos.id_conta = " + recuperaConta().getId() + " "
                            + "and pagamentos.conciliado = true";

                    PreparedStatement ps = con.prepareStatement(sql);
                    ResultSet rs = ps.executeQuery();
                    con.close();
                    HashMap params = new HashMap();
                    JRResultSetDataSource ds = new JRResultSetDataSource(rs);

                    JasperPrint impressao = JasperFillManager.fillReport("D:/pagamentos_conciliados.jasper", new HashMap(), ds);
                    JasperViewer.viewReport(impressao, false);
                } catch (Exception ex) {
                    ex.printStackTrace();
                }

java.lang.NullPointerException
        at net.sf.jasperreports.engine.JRPropertiesMap.readObject(JRPropertiesMap.java:176)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:88)
        at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:515)
        at br.com.audcont.conversor.apresentacao.DialogRelatorio$6.doInBackground(DialogRelatorio.java:266)
        at javax.swing.SwingWorker$1.call(SwingWorker.java:278)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at javax.swing.SwingWorker.run(SwingWorker.java:317)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)