DataPortal_Fetch not implemented

I try ProjectTracker with SL with CSLA 4.3.14.0

I got this message "DataPortal_Fetch not implemented" on LogIn procedure:

 public static void GetPTIdentity(string username, string password, EventHandler<DataPortalResult<PTIdentity>> callback)

    {

DataPortal.BeginFetch<PTIdentity>(new UsernameCriteria(username, password), callback);

    }

In my App.xaml Start_Up I have

  Csla.DataPortal.ProxyTypeName = "Local";

What could be the reason?