Hello guys.
I want to render a simple FLIP simulation.
I cache generated FLIP mesh but in some frames mantra render the mesh with some black squares!
Can anyone help me to solve this problem?
Thanks.

On the Limits tab make sure you don't have At Ray Limit set to black. Try the other option. And add some kind of background to your scene. At some point your rays will quit bouncing and if all that is around is black, that is what you'll get in your render.

Thank you Enivob.
I solved this problem with check Lock Sample.
But I will try your advise.
Regards.