Erro sub-relatório Ireport

java.lang.NoClassDefFoundError: org/apache/commons/javaflow/bytecode/Continuable

at java.lang.ClassLoader.defineClass0(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$100(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

import java.util.HashMap;
import java.util.Map;

import javax.swing.JOptionPane;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRResultSetDataSource;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.view.JasperViewer;

public class RelatorioChamados extends PessoaSql{
		 
	private String dir = "C:\\java\\sysChamados\\";
	private String relatorio,setTitle;
		
	public RelatorioChamados(){
			
		relatorio	= "RelatorioChamados.jasper";
		setTitle	= "Relatório de Chamados";
				
		Map parameters = new HashMap();
						
		try {
			ChamadosSql sql = new ChamadosSql();
			
			JRResultSetDataSource jrRS1 = new JRResultSetDataSource(sql.relatorioChamados());
			JasperPrint print;
			print = JasperFillManager.fillReport(dir+relatorio,parameters,jrRS1);
			JasperViewer jrviewer = new JasperViewer(print,false);
			jrviewer.setTitle(setTitle);
			jrviewer.setVisible(true);
			
		} catch (JRException e) {
			JOptionPane.showMessageDialog( null, e.getMessage(), "Aviso",
		    JOptionPane.WARNING_MESSAGE );
		}  
		
		
	}
}