DaemonUmbra

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

That log shows us nothing. If you restarted the launcher after the issue you need to recreate the issue. Start Launcher Reproduce issue Stop Launcher Do not start the launcher again until after step 4 Provide Log

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

Do you know Java?

This is something you'll have to ask the Fabric folks about, we don't provide user support for their software

and you have Java installed, correct?

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

Are you sure you got the installer and not the MDK?

Are you actually on a LAN connection together or are you using LAN in conjunction with something like Hamachi?

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Please make your own thread and provide logs or screenshots

Unplug your gamepad

That looks like an issue with move plus from what little info you've provided

1.14 is no longer supported. Please update to 1.15 or 1.16 to receive support.

User was banned for piracy. Buy the game.

What do you mean by the wrong file?

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 due to its age. 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.

Odd... it's looking like your game detects blocks from a mod that was removed, makes a backup, and carries on, but then doesn't filter those blocks out for his client connecting...

Probably one of those batch files that automatically downloads and runs Forge if it's not detected

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

I doubt that's what fixed it, but at least it's working

There were problems with Forge's fileserver on the host end, they should be resolved now