Ugdhar

I believe you need to put your walls.json in data/minecraft/tags/blocks

net.minecraft.item.Items

Correct, as there aren't any TEs to attach anything to without a world!

I just checked using forge 1.15.2-31.1.46 and the event fires for me and a breakpoint works. Do any other breakpoints work? Maybe post a debug.log, it might have a clue what's going on.

1.12 is no longer supported due to age. Please update to a modern (1.14.4/1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

net.minecraft.block

Please post your debug.log from the logs folder within the game folder. It should have information to help figure out why you are crashing.

Start a new thread, and post your debug.log as described in the EAQ. There are a million reasons the game can crash at startup, and your problem may not be the same!

Show a 1.15.2 log using Java 8, I do not believe Java 14 is supported. Also, 1.12 is no longer supported due to age.

Yeah, the twitch launcher sucks at installing forge, and that's a likely cause of the error, although I'll be honest and this is a stab in the dark without debug.log. What I've done in the past is download the twitch modpack, close out of the twitch client, make sure I have the exact same version of forge installed the modpack is calling for, then create a new installation in my normal vanilla launcher that points to the modpack folder in twitchs Instances folder. You could try that and see if it makes a difference. Just make sure you install the same version of forge the modpack wants to use, older can be missing things, newer can have breaking changes.

Please post the debug.log from your game directory logs folder. It will give details on what's going on. Unfortunately without it, it's all just blind guesses!

So I've been tinkering with Biomes recently, and I'm wondering if anyone has any insight into the methods used by the biome builder, in regards to what they do/how they affect biomes spawning. Example taken from PlainsBiome: .depth(0.125F) .scale(0.05F) .temperature(0.8F) .downfall(0.4F) .waterColor(4159204) .waterFogColor(329011) .parent((String)null)); Looking at code and what different biomes set these values to, I've come up with some guesses for a couple. depth - Oceans have -1.0, Mountains have 1.0, Rivers are -0.5, with other biomes being between 0 and 0.2, so based on what elevations you want a biome to show up in would affect what you put for this value. scale - not sure temperature - Desert is 2.0, and "Frozen" biomes are 0, and other biomes seem to be just under 1.0, which I would imagine is "average temp" downfall - not sure. Any more information anyone has on this, feel free to chime in! Thanks for any and all input!

Nope, I think this one is magic, give it a try! And if you update your mappings, things have better names.

I'm not seeing "count" as an available option for smelting recipes: https://minecraft.gamepedia.com/Recipe#JSON_format

- Please keep posts on this forum in english - Really Old versions of Minecraft/Forge are no longer supported. Please update to a modern (1.14.4/1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

That was not even what the error was about. The error was because he had capital letters in his modid: If you are having an error, start a new thread and post logs as described in the EAQ, don't just add on to someone else's thread.

Unfortunately I am not sure what is causing that error. Perhaps try removing mods 1 at a time since you only have a few, and see if it works. I would start with Extended Caves, only because in the log it mentions jigsaw features, which I would think would be used making caves. If it still crashes, maybe lycanite mobs since it has about 8 million other non-fatal exceptions in the log. Perhaps someone else will see this thread and have a more informed answer for you. Sorry I couldn't be more help!

Make sure to read the Optifine changelog for versions you will be using to see what versions of forge they work with. Optifine is very picky about which version of forge it works with, and each Optifine version usually is for a specific forge version, as mentioned in the Optifine Changelog.

Just look at the FillerBlockType enum, I believe it has a method to add or create a new one built into it.

I would guess that something is broken in the Charm mod. I would try removing it or updating it (looks like there's a new version as of a day ago)

Please post the debug.log found in the logs folder of your game directory. It may be quite large, so if it will fit here, please use spoiler tags. You may have to post it on an external site and link it here depending on the size. debug.log has much more information in it than a crashlog.

That means the file C:/Users/Playtech/AppData/Roaming/.minecraft/config/CustomSpawner/overworld/Biomes/Undefined.cfg is not formed properly. If you edited it by hand, undo your edits, if not, you could try to fix it, looks like it just perhaps needs a space removed from the beginning of the file. Worst case scenario, you could delete/move/rename the file and see if just removing it from the situation helps.

Take a look into net.minecraft.world.biome.DefaultBiomeFeatures and search for addOres. A quick glance shows you probably have to add to the FillerBlockType enum and then use that in your OreFeatureConfig.

ore is generated using features, take a look at net.minecraft.world.biome.DefaultBiomeFeatures and search for addOres