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I was right you have a malformed json file. This looks wrong: https://github.com/slit-bodmod/lotb-mod/blob/master/src/main/resources/data/minecraft/tags/items/logs.json#L4 https://github.com/slit-bodmod/lotb-mod/blob/master/src/main/resources/data/minecraft/tags/items/wooden_stairs.json#L4 https://github.com/slit-bodmod/lotb-mod/blob/master/src/main/resources/data/minecraft/tags/items/wooden_buttons.json#L4 https://github.com/slit-bodmod/lotb-mod/blob/master/src/main/resources/data/minecraft/tags/items/slabs.json#L4 ditto the same problem for the block tags

Well, it can, if the json file is invalid. Any invalid json file inside /data will cause ALL data files to not be loaded. Its rather frustrating. Slit_bodmod, its unlikely that the problem is your walls.json file, have you added any other data files (such as recipes or advancements?)

You need to use RenderTypeLookup.setRenderLayer on your blocks in your FMLClientSetupEvent, probably with RenderType.getCutout()

It looks like you have an invalid configuration somewhere. You can either try to fix it, or delete your config folder if you haven't made any changes to it. Or rename it if you don't like deleting things. It should be recreated on next launch.

https://wiki.mcjty.eu/modding/index.php?title=Tut14_Ep10

It looks like you may have a broken config file. If you haven't modified them, you can try deleting the config folder and they should rebuild on the next run. If deleting makes you nervous, rename it to config.old or something in case you need it.

Assuming you are using IntelliJ, once you import the gradle settings the Minecraft source code (along with all the other dependencies) would be under the "External Libraries" in your project. For the code it would be the 'net.minecraftforge:forge:1.X.X-X.X.X_mapped_snapshot' and for the assets (textures, json, etc.) it would be under the 'net.minecraft:client:extra:1.X.X' Intellij also provides shortcuts to getting to the source code of a file by holding control and left clicking the class, method or field. Eclipse is a somewhat similar process.

Is that a JoJo reference?

You also need to add a loot_table file for your block drops. If you need an example check out the vanilla jar file. Or look it up.