Luis_ST

no the Configs are only replaced with the default Config

Error in 'Multipart', make sure you use the latest version, if you already use it, report the bug to the Mod author.

post debug log

show your code

only java run the installer via the command line and post full output

yes they should

extends the vanilla TargetGoals, look into the MonsterEntities for example how to add the Goal

Delete this server config File

First: 1.8 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support. Second: This is the Forge Forums not Fabric

Forge only supports full version. -> 1.18, 1.18.1

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

Post debug log, you can use https://gist.github.com/ to upload the log

Delete this server config File

Create a new instance of your CreativeModeTab, store it in a static final Field and use this Field as parameter in Item.Properties#tab

go into .minecraft/config and delete the forge-client.toml file

no crash inside the log you post, but try without Optifine, since there is no compatible version with Forge for 1.18.1 yet

delete this client config

uninstall java completely the reinstall java

if you want to replace all TargetGoals, yes

i'm stupid 😅

you need to extends the vanilla Goals, overwrite the tick method and call super if you want to run the vanilla logic

post launcher and debug log

the best way would be to replace the target Goals of the Mobs in EntityJoinWorldEvent, with your own TargetGoals

post log