Attaching a scenenode with a body to other scenenode

As the title says, I created a scenenode then I attached OgreNewt::Body to the scenenode.
Then I created another scenenode then I attached the scenenode with the body to the second scenenode.
But then the program crashes after exiting. Why does it crash?

Do you remember to delete the collision model and the World before your app exits?

Yes, the program works perfectly fine when I don't attach a node with a body to another node.

you made the SceneNode with a rigid body the child of another node?

why?

To make camera follow the body and I want the body to change direction without changing the camera's direction.

Oops, my bad.
What I should say was that
I attached a node with an entity to a node with body
then I got an error after exiting.

I don't see why that could be wrong. Check your detaching and deleting order, and be sure there are no references from one element to other already destructed in the destruction time. I mean, don't delete the node and then try to detach and delete the entity or something similar.

I was using Dotscene and I found that node needs to be created manually using new SceneNode(...).

So I did that and I get no error after exiting.
But now, objects attached to a node with body are not placed properly.
Their positions are not relative to body's position. But the initial position of the parent scenenode.

I'm stuck again : S

EDIT:
Again, I was doing something very wrong.
I found that creating scenenode manually is not recommended ( new SceneNode(...) )
So I tried mSceneMgr->getRootSceneNode()->createChildSceneNode(...)
And then, it works!
In the end, the first problem was, I was using
mSceneMgr->createSceneNode(...)

That was it.
It's working fine now.