Grasshopper + Kangaroo

I installed the Kangaroo plugin and tried to open this gh definition (14.5 KB) (its a fixed radius circle packing algorithm). I got an error message warning me of 4 IO Grasshopper errors. I dismissed the message and rhino WIP crashed. I had a similar errors with another definition by David Picker found here but no crash.

Here is the crash report sent to apple: GfM_Kangaroo.txt (94.5 KB)

Third party add-on support is not complete for the mac version of GH.