how to adress a symbol created with sym.createChildSymbol

Hi,

I want to create a symbol (as a MovieClip) when I click a button and I want to load into that symbol a Edge Composition.

This is my code:

var pageContent = sym.createChildSymbol("content", "Stage");

EC.loadComposition("cvcontact.html", sym.getSymbol("pageContent"));

That is the way I FOUND in Edge to try work as I would with Flash, loading differents swfs.

It is not working.

The console gives me that error :

2. [ ERROR | EdgeCommons | Core ] Error in loadComposition(). Arguments 'src' and 'sym' are not optional. EdgeCommons.js:3
   1. b.error

Please, do you have any direction to give me where to look at ?

thanks a lot

sergio