Vray GPU motion blur Error

[alessandro.d84]

Hi, i forgot to say that i' ve also a retime in the Tycache.

Now I change the VrayCamera parameter shutter speed and it seams to work with no problem i've tried also to put again the old value and no more error.
It has already rendered 30 frames.

Probably is a Vray problem i think.

Am I doing right for the Tyflow set up? is this the correct way?

Thanks