Luis_ST

the file is empty, btw you can use https://gist.github.com/ drag the file there it's very easy and post l the link here

use the effect to make the player invisible

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

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add all mods then post the log

with all mods?

did you join the server? because there are no errors

vanilla.....!

tick events fired twice (START and END), and between START and END there is a short period of time during which your player is visible

run the game it will be create automatically

debug please, it contains more infos what crashes the game

then post the client log its in .minecraft/logs/debug.log to explain why I asked that: Just Enough Resources crashes the server a problem that a few people already had so I speculated that you have the same problem

it's an mod, does your modpack contains Just Enough Resources

did you use Just Enough Resources?

post the full client log

you should post the full log, but you're using java 16 but minecraft 1.16 requires java 8-15

this is not really helpful, do what @diesieben07told you

okay first of all, you don't need an IStorage, just return and empty CompoundNBT, you should because the error occurs there inside of getCapability you need to check if it is your Capability and your serializeNBT and deserializeNBT methods in your StaffProvider are broken, add a serializeNBT & deserializeNBT to your DefaultStaffCapability and call them inside the method why did you add two providers to the ItemStack? you should also create a git repo because it is terrible to look at many classes when using pastebin

so it's now @Mod(BlacksmithMod)?

okay the whole thing is a bit complicated, as you already found out you need an Access Transformers, use it to make the field customSpawners in ServerWorld public then use WorldEvent.Load and check whether the world of the event is a ServerWorld if so, you can simply add a new instance of your spawner to the CustomSpawner list Edit: the AT for ServerWorld.customSpawners is: public net.minecraft.world.server.ServerWorld field_241104_N_ # customSpawners

post the log

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https://mcforge.readthedocs.io/en/latest/datastorage/capabilities/#attaching-capabilities