I've had a very quick look and I can't see anything. It says that it is creating the default light set (this should be there by default anyways and if you have any lights in your scene it gets overridden by them) . So what I would suggest is creating a new scene and importing your old scene into it. That way you should already have a default light set and it wont try and create one.

I've never seen this problem before and I've never heard of it creating default light sets... strange.


Alan