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Looks like an issue with Cataclysm and Assembly Line Machines.

They just sent a generic packet to the minecraft port which immediately disconnected them because their "hello" was garbage, so no problem there. You might have a problem if they actually found a vulnerability on a different port. But this is getting off topic for this forum.

This looks like a "script kiddie" running a penetration test on your machine. The ip address is probably a bot machine they have already hacked - unless they are very dumb. 🙂

Use the Minecraft Launcher to create a new installation and run vanilla Minecraft 1.12.2 first at least up till you get game loaded screen. Then exit out, and edit the game configuration to run Forge 1.12.2. Then run that until you get to the game loaded screen. Then you can exit out of the Launcher and add mods to the mod directory that forge created for you in the working directory.

[18Aug2022 01:12:41.158] [Render thread/ERROR] [net.minecraft.world.level.storage.LevelStorageSource/]: Exception reading C:\Users\Princess\AppData\Roaming\.minecraft\saves\16_5 Creative (Azimuth) NonBOP-copy\level.dat java.lang.IllegalStateException: Unable load old custom worlds. at net.minecraft.util.datafix.fixes.WorldGenSettingsDisallowOldCustomWorldsFix.m_185165_(WorldGenSettingsDisallowOldCustomWorldsFix.java:25) ~[client-1.18.2-20220404.173914-srg.jar%2374!/:?] Your world uses the old custom world format that minecraft no longer supports in 1.18

You need to override #getEnchantmentValue in your Item class too, the value must be larger than 0. You don't need to override #isBookEnchantable unless the Block should be work similar to the vanilla Book (Enchanted Book).