Voronoi error

Hi

I keep getting this error for the Voronoi function every time I use it. I tried different .dyn files and all pop-up the same error.

It might be related with Dynamo for Revit, because the programs work fine in Dynamo Studio.

 

I have Dynamo 0.8.1 on Revit 2015/2016.

Regards,

L.

 

Error