Problems with: cannot find bean under name concesiones

[Federico Real]

I obtain the folowing error to access a my JSP Page. Only if i use Internet Explorer 
6.0.2 in Windows XP

"javax.servlet.jsp.JspException: cannot find bean under name concesiones"

My JSP:

<html:select styleClass="formTextoPeq" property="concesion"  
onchange="ejecutarAccion('ElegirServicioServicio.do')" > 
                                                          <logic:notPresent 
name="servicios"> 
                                                          <html:option 
value="">Seleccione 
                                                          Concesion</html:option> 
                                                          </logic:notPresent> 
                                                          <html:options 
collection="concesiones" property="identificador" labelProperty="etiqueta"/> 
                                                          </html:select> </td>


My ACTION:

ArrayList concesiones = new ArrayList();

   
      HttpSession sessionActual = request.getSession();
      sessionActual.setAttribute("concesiones",(ArrayList) concesiones);


Any solution? Why only in Internet explorer 6, in 5.5 or Netscape 7 works!!