Error generating report

I have a JavaFX application where I have a button that generates reports. But when I try to generate the report this error happens:

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

This is my method that generates the report:

 @FXML
     private void gerarRelatorio(){
         try {
            Map<String, Object> filtro = new HashMap<>();
            InputStream image = this.getClass().getResourceAsStream("/br/com/justi/view/relatorios/leaf_banner_green.png");
           filtro.put("status", cbStatus.getValue().toString());
            filtro.put("IMAGE", image);


            InputStream inputStreamReal = getClass().getResourceAsStream("/br/com/justi/view/relatorios/contratos.jasper");
            JasperPrint jasperPrint = JasperFillManager.fillReport(inputStreamReal, filtro, ConexaoMysql.abrir());

            JasperViewer jrviewer = new JasperViewer(jasperPrint, false);
            jrviewer.setVisible(true);
            jrviewer.toFront();

        } catch (JRException ex) {
            JOptionPane.showMessageDialog(null, ex);
        } catch (Exception ex) {
            Logger.getLogger(FrmListarCadastrosController.class.getName()).log(Level.SEVERE, null, ex);
        }

     }