Why am I getting an error on D2D1_ELLIPSE structure?

Question

I'm getting an exception on this simple code.

	pEllipse = D2D1::Ellipse(
		D2D1::Point2F(100.0f, 100.0f),
		50.0f,
		50.0f 
	);

I can't figure out why.

Edit:

I can't delete this post, but actually, I realize the problem is due to something else, so I will have to go through the code from before that point.

I'll review this.