I'm trying to create a site definition that uses a custom master page.
I created a module in VS, called MasterPages, in which there are two folders (one inside another): _catalogs, masterpage.
Within this folder i put my custom master page, socialfeed.master.

This is my Elements.xml Module configuration:

    <?xml version="1.0" encoding="utf-8"?>
    <Elements xmlns="http://schemas.microsoft.com/sharepoint/">
      <Module Name="MasterPages" RootWebOnly="TRUE" Url="_catalogs/masterpage">
        <File Path="MasterPages\_catalogs\masterpage\socialFeed.master" Url="socialFeed.master" Type="GhostableInLibrary" IgnoreIfAlreadyExists="TRUE" />
      </Module>
    </Elements>

And this is how i bind my custom master page on my site definition's default page:

    <%@ Page language="C#" MasterPageFile="~/_catalogs/masterpage/socialfeed.master" 

I can actually deploy the solution without any problems but when i try create and access a new subsite based on that definition i get an error:


    Error=The file /_catalogs/masterpage/socialfeed.master does not exist.  

Could you please help me understand where is the problem?
Thanks.