Exceptions when using included brush

Hi,

I recently bought the complete bundle and wanted to try out the brush tool.
I created a terrain, added the Map Magic Brush script on the terrain, and selected one of the brush preset included with the asset.
The problem is that I have a bunch of exception when selecting any of the included brush preset :
https://puu.sh/HBR5Q/c706029066.png

In addition to that, I can't open the graphs, nothing is happening when clicking on "open".
Also, I already have around 60-100 exceptions when I'm importing MapMagic to a new project :
https://puu.sh/HBR5K/52f1aec261.png

I tried on a different computer, same problem.

Am I doing something wrong or is that a known bug ?

Thanks !