PArray motion blur issue

Not sure if the problem lies with Max or Vray but I’m having trouble getting a waterfall I created with PArray to render with motion blur using a standard cam and the vray camera overrides.

I keep getting the message: ‘Object PArray01 has changing topology, can’t motion blur mesh deformations’

I’m not sure which setting I should change to remedy this though.

try doing a quick search as I believe this issue has already been raised [unfortunately without a solution due to technical reasons ]