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Can't use height blending alongside texture bombing?

I tried to make a material that height blends two material functions which are just a basic material with some texture bombing applied to them. But I get an error that I’m using a DDY node or something?

Anyways, I have 0 clue what i’m talking about, so here is the link to the materials and the material fumnctions. I didn’t include the textures since I didn’t want to share a huge file, but I guess you can use any texture just to test it out.
https://drive.google.com/file/d/1FjC…ew?usp=sharing