I'm trying to pull the latest version on branch 1.12 and it says BlockUtils is missing, as well as VecUtils and some other classes. I believe you have forgot to add them to git

I have created a tutorial video which might help you: https://www.youtube.com/watch?v=7Ahshi_QjM4

Furthermore don't forget to add CreativeCore and IGCM if you want to work on LittleTiles.