no support for this device type on vps

My game server is made on Unity.
In 3.4, my vps could run the server,
but i upgraded the project to 3.5, vps can’t run now.

VPS has no gfx device to run this but my game server doesn’t need render,input etc.
can i run it on 3.5?
or i will go back to 3.4

console error:

GfxDevice: creating device client; threaded=1 d3d: no support for this device type (accelerated/ref)

it wasn’t happen on 3.4

on 3.4 it could run and i got this message on the log

d3d: no support for this device type (accelerated/ref) D3D9 initialization failed, using OpenGL OpenGL: ......

Check out the list of arguments you can start your headless client/server with here - specifically the batchmode - http://unity3d.com/support/documentation/Manual/Command%20Line%20Arguments.html