Unable to batch render with V-ray in Maya2013

I'm using V-ray 2.30.01 with Maya 2013 and I found unable to batch render with it.:(

1. I created a cube
2. Apply V-ray material to the cube
3. Set some animation for 10s
4. I go to render setting and choose jpg. for the Image Format, check the Animation box and set the End frame to 10
5. Render>Batch Render

Finally,Maya tell me the render task is done but it isn't OH GOD THE DRUGS
All I have is this:
// Rendering with V-Ray... //
// Result: Rendering Completed. See mayaRenderLog.txt for information. //