Problems with setting up the A* PAthfinder by Aron Granberg

Hey folks,

i’m trying to set up the A* Pathfinder Script by Aron Grandberg. Basically i’m setting it up just as it is in his “demo scene” called “house” but with the difference, that i use my own 3d modell. I’m allwas getting the error, that no nodes are walkable. i can’t find the error :confused:
I’ve attached a screenshot containing my setup. need help.

Noone has a hint? :confused: