AntFarm Failure to write object table in 3dm file

Hi,

I am learning how to use the pluggin called AntFarm.
I created severals datasets.
One of them uses categories as element attributs.
It is possible to color my elements according to the category to witch they belong.
When I display the element colouring and want to save my file, I can’t and get the following error message :


I am forced to close the file without saving and I lose all my data in the other datasets.

Have other people encountered this error and managed to correct it?

Thanks for your help.

Mathide