DirectX errors

[Planetary]

This is relating to the issue that jaskel has, in fact its the same, but i think i may know why mine is doing it.

I get the error

Error: D3DERR_INVALIDCALL
File: M:\releases\realflight\3.5\calvin\kelib3\directx\D XEffect.hpp
Line: 617

when i try to load up
Im running G3.5

I think the problem may be that for some reason, realflight is in conflict with DX10
I have an 8800, and thats what they run. I have the lates DX version, and my graphics drivers are up to date. Im not sure why its doing this, and have no idea how to fix it. Just some further information to help.