No responseundefined

[ratha]

Hi all,
I'm facing such an exception when try to communicate with 
ode.server(InstantmanagementAPI)..
Any ideas?
ps: code segment is as follows,
function getAllInstaces()
    {
   try{
        instances_available  = 
InstanceManagementService.listAllInstances();    
            return instances_available;   
         }
   catch(err)
         {
               if (typeof err == "string") {
               alert("Exception Occurred" +err.toString());
              
           }
           else {
               alert("Exception Occurred !" + err);
           }
         }

    x=instances_available.getElementsByTagName("iid");
     for (i=0;i<x.length;i++)
             {
             document.write(x[i].childNodes[0].nodeValue);
             document.write("<br />");
             }
}

thanks.
-ratha.