8-Bit KitKat

Hello, I have been searching everywhere for info on how to do this, I've tried several things similar to this in my blocks blockstate json Several posts have suggested looking at the Minecraft source code but I really have only had one idea on how to do that, it being that "It's a library in eclipse". I've tried my best looking for it but can't find it. Another thing I've tried is adding this override to my block's code: But could not get FACING to work. I later found this when trying to fix the facing issue: But none of this has worked, so I've come here to ask for help.

I'm no expert but it looks like don't have the vanilla version of the forge version you are trying to run. there are several lines similar to this one: [Info: 2019-07-04 14:17:01.7987306: GameCallbacks.cpp(138)] Game/dum (Server-Worker-24) Error Using missing texture, unable to load minecraft:textures/block/red_sandstone1.png : java.io.FileNotFoundException: minecraft:textures/block/red_sandstone1.png It's saying it can't find a certain texture