Hello, everyone. I’m sure I’m not the only one with this kind of problem, as I’ve watch some videos talking about this very issue, if there is a post about this already I’d like to be reffered to.
I’m working on a level, and I’ve imported my height map from world machine, everything went well. The point is, when I come to texture it I find it imposssible. I’ve set a material, with 3 layered textures. When I first tried to paint it I couldn’t use the brush, I was painting big quads, like the whole component or something. I found a video about a guy having this same problem, and he fixed it by painting evruthing with the base material first, then the grass material, and after that he could use the brush properly. I did the same, and for some reason I couldn’t make it work with my 3 layers: either I could use only 2, or more common, I get something like the picture. I tried biulding everything again, and I got the error I share below.
I have no idea how to make this work, any help is appreciated. Thank you!

