larsgerrits

Try disabling the loading screen as described in the EAQ.

Try updating your graphics drivers. The issue can also be caused by the loading screen. You can try disabling it it the Forge config.

CraftGuide is broken. Make sure you're using the correct version, and report it to the author if it keeps crashing.

Really? It's been an hour, and you're already bumping? BlastingElsewhere is broken. Make sure you're using the latest version. If it still crashes, report it to the author. Also, tell the author to stop using MCreator.

1.8.9, however, you should always use the latest (1.12.2) as it will have the best support.

1.7.10 is no longer supported on this forum. Please update if you want help.

What version are you using? In 1.12.2 the constructor is public and has a different signature.

Item#setLightLevel takes a float between 0.0F and 1.0F, instead of going from 0 to 15. If you want to have the max light level, you use 1.0F.

I always thought that World::rand was tied to the seed, and I never bothered to look into it as it would make sense. And I also just looked, and the Random used for world generation is a completely different one, which is made from the seed.

World::rand is based on the seed of the save, so if you use that in e.g. world-gen, you'll get the same results every tim you generate a world. If you make a new instance of Random, it will generate different numbers everytime, even if you use the same seed. So use the World::rand for consistency among things. I stand corrected.

Then try your best to translate it to English. The English in your main post is better then some of the English speaking people I know, so don't think you can't write English

This is an English only forum, no need to use both English and French. As for your question: this is a good example on how to do it. Don't blindly copy the code, but try to learn from it. Read the docs if you don't understand something.

You're using Item::getItemAttributeModifiers, you need to use Item::getAttributerModifiers. It's a different method with a different signature.

I think you also need an item model. Look at the cobblestone wall blockstate/models.

Well, there's your problem.

There's PlayerEvent.PlayerChangedDimensionEvent you could use.

1.4.6 is no longer supported on this forum. Please update if you want help.

If there's no fml-client-latest.log inside the logs folder of your run directory, you're not running the game.

I don't know if Gradle works with Java 9 or not, but you still won't be able to use it because ForgeModLoader doesn't work with Java 9.

That's in his first & second crash. In his last crash, that issue is resolved (he removed The Twilight Forest).

He's probably refering to the @Mod.EventByusSubscriber annotation, which can be used to register event handlers without calling MinecraftForge.EVENT_BUS.register. In that case, you have to make the @SubscribeEvent methods static. https://mcforge.readthedocs.io/en/latest/events/intro/#static-event-handlers

Update Forge. PlayerSPPushOutOfBlocksEvent was added in Forge 1.12.1-14.22.0.2452, while you are using Forge 1.12-14.21.1.2387.

One of the mods is crashing, probably because of ASM. Remove all the coremods (listed in the error log at the top), and run it again. If it doesn't work after that, remove mods 1 by 1 to find the crashing mod.

In ItemStraw, you are calling setRegistryName with null.