loordgek

there is no super public class AltarSerializable implements ICapabilitySerializable he returns null in getCapability

you dont need to get server player

GuiOpenEvent is fired on the client

it cant be null @Override public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) { if(cap.equals(AltarCapabilityDef.ALTAR_INVENTORY)){ return holder.cast(); } return null; } dont return null here that will break use LazyOptional.empty()

dont lie plz

dint see the you are a dev yes as of 1.17 you need java 16

if you use the minecraft launcher you do not have to do anything

https://mcforge.readthedocs.io/en/1.16.x/datastorage/capabilities/

you need to look server side for items and sent them to the client

must be lowercase

show your block class

use lambdas https://www.w3schools.com/java/java_lambda.asp for getSickness use LazyOptional::map

is this what you want ? https://www.planetminecraft.com/mod/lucky-block-command-creator---thvardhan-minecraft-19/

yes

you want https://github.com/amadornes/MCMultiPart

maybe it is time to buy a new/used one

in build.gradle you need to change the maven url in the build buildscript from https://files.minecraftforge.net/maven to https://maven.minecraftforge.net/ and

why?

put this somewhere in the build.gradle repositories { maven { url = 'https://libraries.minecraft.net/' } mavenCentral() maven { url = 'https://maven.minecraftforge.net/' } } if you already have a repositories block put it in there

you need to change the maven url in the build buildscript from https://files.minecraftforge.net/maven to https://maven.minecraftforge.net/

dont do that

dont create a new stack to check, check the item it self

yes you can make a server side only mod

yes