Kangaroo error while simulating

Hi all,

I started using Kangaroo and managed to figure it out a little bit. If i use this script on a smaller scale and with a sphere instead of surface that is extended it works. Now it shows the following error:

1. Solution exception:Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

The squared surface should move up and should end up like the bigger surface.

Thanks,

Ari