DaemonUmbra

How are you finding the IP that you're giving them?

Who was it that wasn't able to connect? You or friends?

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

Please don't necro ancient threads.

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

I'm not sure how this is happening but with the amount of coremods you have installed I don't think it will be accepted as a bug report. If you remove the following and mods that depend on them does it still crash? Abnormals Core Better Weather Buzzier Bees Endergetic Expansion Gel API More Waterlogging Neapolitan OpenLoader Placebo Player Eating Animation Quark Rare Ice Revamped Wolf Savage and Ravage Upgrade Aquatic Xaero's World Map

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

Have you tried looking at how Vanilla does it?

Ok... remove Optifine and OptiForge, and run the game without Twitch. Then provide debug.log and not latest.log

Please provide debug.log (more info on where it is and how to submit it in the "Logs" section of my signature below)

Please don't hijack other users threads when your issue isn't the same, and no "we both crash" does not mean your issue is the same. Also, RLCraft is 1.12.2, which is no longer supported. Please update to receive support.

Do you know Java or are you trying to learn Java through modding?

If you're using IDE RunConfigs, or running the Gradle tasks in two separate terminal instances, I think so

Please never use the words "Latest version", just say the version number. If there's no error how do you know it's not working?

If you're using an IDE it should have the option to run both a server and a client

Support for 1.15 will likely be dropped when 1.17 drops, and that's up to Mojang. If you want to keep receiving support you have to keep your mod updated to the latest Minecraft Version or at most one version behind.

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

Please provide debug.log

Try removing Optifine?

From the looks of their github repo, Catch Everything in Book isn't being reobfuscated during build, so it's not usable outside of a development workspace

Is this preventing you from playing? Is there something stopping you from simply removing the offending mod?

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

Please don't necro old threads. If you have an issue make your own thread.

Try deleting C:\Users\Sebas\AppData\Roaming\.minecraft\config\forge-client.toml