Hey @JanStapler and @Angius ,
I tried this awesome Plugin today. I had the exact same errors as soon as I put in my own level and couldn’t figure it out. I then opened the sample project and migrated his bot over to my project, changed a few things to satisfy a goal, and it still wouldn’t work. I then thought my level was too large, so I made a default level from file new level, with a little floor. I put DonManager into the scene, and sized it using the X, Y, and Z properties in the Manger, NOT the transform (scale). The bot went right up to a goal with no issue.
I then went back into my other level, deleted DonManager, placed a new one back in, sized it using the X, Y, and Z properties of the DonManager and not the transform (scale). This worked. I now have flying AI without issue. Since my error is the same as yours, I’ll bet you also used the transform scale tool to enlarge the area. This is where I went wrong.
I did not do what the author suggested in his instructional video, which IS to use the X, Y, and Z grid size properties within the DonManager to edit the size of the volume.
edit: I also got an error (same error) when the AI went out of the bounds of the DonManager.
Please let me know how that works out for you.
-Erol