Light/terrain problem

Unity Engine
1

I had bought Unity Game Development Essentials. On page 28 I must create a lightmap with a Directional Light but my Unity have only a ‘none’ object. If i try to create the lightmap with the ‘none’ object Unity give me an error:
TargetInvocationException: Exception has been throw by the target of an invocation

What can i do?
Thanks to all :smile:
If i also use the Raise Height tool it son’t want to work :cry: but if i go into the game view i can see the terrain modified… :shock:

2

Now i had created a new project without the lightmap and if i use the raise tool it work immediately i think that the problem is the lightmap :cry: