Why is SubSonic and ActiveRecord throwing an exception when updating a record? (Take 2)

Question

I am experiencing the same error and stack trace as this question. However, I am using the latest code from github as of today (6/11/2010) and I am not having the compilation problems mentioned in the other answer. Other differences from the other poster:

• My class looks like this:
  

  public class ActiveRecordClass1
  {
      private List<ActiveRecordClass2> collection;
  
  
      public void OnSaved()
      {
          foreach(var o in collection)
          {
             o.Save();
          }
      }
  
  
  }
  

I get the exception on the o.Save(); line so it looks like provider is not null for the outer class but null for the inner class. I am loading the list by using (List<ActiveRecordClass2>)ActiveRecordClass2.Find(x => ...);

• I am using .NET 4.0 instead of 3.5.

Does anyone know of a fix or workaround (maybe a workaround in ActiveRecord.tt)?