Cannot blend 3 texture sets using height in landscape material

As in the title. Whenever I try to blend 3 sets of textures (albedo,normal,masks) using a height map, the landscape material stops loading. Is there a way around it ?

I know this is an old post, but in case anyone else comes across this you were mostly going over the maximum texture sampler count. If I’m correct in this assumption then the fix is to click on each texture sample node and setting the sampler type to “shared wrap”. I had this issue in the past, and though I can’t remember the exact details, the material editor was not reporting the error for some reason.