Bongo2.0 render animation doesn't work

I am trying to render animation in bongo (using vray)
but it says 0"Error saving image".
when i click the render animation it just render once and stop then.
the animation page( i mean the page that shows 0%-100%) suddenly disappeared after first rendering.
I already checked the batch.
How can I solve this?

Are you using the latest version of V-Ray 2.0?
Please check the second note on this page: