DaemonUmbra

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

I don't see a license anywhere that gives you permission to mod Optifine. Have you asked them if you're allowed to? If so please get assistance from them. We won't provide it.

Have you even bought the game?

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

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

This looks like Twitch fouling up Forge's install process. Try repairing the instance, if that doesn't work there's a video in my signature about launching Twitch packs without going through Twitch

That looks like you're missing a native library, I seem to recall someone solving this issue by using a different method of installation (installer -> package manager or package manager -> installer) can't remember which way around it was though. We tend to recommend https://adoptopenjdk.net for Java, and they have both installers and instructions on adding their repo to your package manager

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

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

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

Then I don't know what you were saying, it sounded to me like you were complaining about not having all your saves and configs in once place anymore

Possibly an issue with JourneyMap not handling its packets properly

As the issue has coremods involved I can't even say what one of them is doing wrong

Is there a reason you're running the task instead of using a generated runconfig?

Why do you want to do this?

You should be setting it to not use the daemon

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

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

If you haven't made any config changes, delete your config folder. This is a known issue we're having trouble identifying

I'm going to say try removing charm and quark one at a time, as they both directly mess with the ItemStack code

Can you provide debug.log please? More info in my signature below.

The idea is that you shouldn't be carrying saves across packs, as this risks opening the save with the wrong pack or even vanilla (which, unlike Forge, doesn't have a mechanism to detect, warn the user about, and preserve what it sees as invalid data).

I'm not seeing the issue, I'm wondering if it's an issue with your graphics drivers

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

If you're looking to mod with Forge you'd better get used to reading source code and looking at how Vanilla, Forge, and other Mods do things, documentation is notoriously sparse and is outdated almost as fast as it gets written.