How to use dict.freeper in javascript

Hello,

I have the following javascript (inspired by helpdetails.js) which I use to store the reference documentation of some object in a personal dictionary. I am getting an error with the freeper() function :

js: helpinfos.js: Javascript TypeError: myDictionary.freeper is not a function, line 29

Can anyone explain how to use the freeper function here ? Is it any necessary ?
Thanks
Vincent

inlets=1;
outlets=1;
var dict;
var myDictionary = new Dict("my Dictionary");
function getInfos(objectName)
{
var shortDesc = ""; var longDesc = "";     
myDictionary.readany("myDictionary.json");
    dict = max.getrefdict(objectName);
    if (typeof(dict) == "object") {
        digest = dict.get("digest");
        description = dict.get("description");
        myDictionary.replace(objectName + "::digest", digest);
        myDictionary.replace(objectName + "::description", description);
        dict.freepeer();
        myDictionary.freeper();
    }
}