Well, I had no idea what a D3D9 Error was either. I decided to
google it to see what could come of that. I found this
BBC Webpage which may be of some help

Here's what it has to say:
Q: What does a d3d9.dll error mean?
A: You need the latest version of DirectX on your computer. This is a free application which is available from the Microsoft DirectX website.
Hope this helps so you can play the game as much as possible
