Why is my landscape not compiling?

I’ve got a bug, I believe. My landscape isn’t rendering, it even appears like this (checker pattern) in the game mode. I’ve tried building it but it takes about 20 hours to build, something somewhere is very wrong. Any help?
Thank you

it has rendered but it seems that there is no texture assigned to it. possibly missing texture

equally, if you have too many textures sampled or compilation errors with your material, you will have issues resulting in default material on landscape. Check your material for any warnings/errors and post them here.

rendered with no errors, no lighting issues, no lightmap problems appear at all. I deleted the landscape and re-made it with the same materials, and it was fine. I think it’s a glitch when you save during a compile, it cancels the compile and bricks out the section