warjort

level = Minecraft.getInstance().level level.isLoaded(BlockPos) Mojang have moved to "sections" instead of chunks. It won't generate chunks on the client, it will crash if you access unloaded chunks.

Whatever mechanism your launcher provides for changing java memory settings. Since it looks like you are using curseforge? There is a slider in the minecraft settings.

Something is modifying a create class and breaking it. Guessing: Probably whatever mod provides that mixins.railways.json ? Maybe this?

You need to give it more memory.

Use a mod like this to analyze what is really happenning. https://www.curseforge.com/minecraft/mc-mods/spark

Issue with debugify, check you have the latest version then contact the mod author.

You have the wrong versions of structurize and blockui, the rest is missing mods: architectury, geckolib3, playeranimator, infinitylib, expandibility, alexsmobs, balm

The launcher log you posted does not show you starting forge. Which likely means you restarted the launcher which will clear that log. Or you posted the wrong log. The curseforge version is in a different place, see my footer.

The last thing in the log you posted above is about optifine. If you tried without optifine that will no longer be true. You likely have a different problem now, but we can't tell you what it is if you don't post a link to the new log files. Also since there is no hard error reported in that above log, post a link to the launcher_log.txt before you restart the launcher after the crash.

https://johann.loefflmann.net/en/software/jarfix/index.html

https://minecraft.fandom.com/wiki/Attribute As it says, UUIDs must be unique per attribute if you want the modifiers to stack rather than overwrite. Obviously if the are globally unique, regardless of attribute, that also avoids clashes.

Download the latest optifine preview release.

MutableComponent.withStyle() and related methods. As you could easily find out for yourself if you used your IDE to search for uses of ChatFormatting.RED. e.g. ItemStack.getTooltipLines()

You told me and repeated it just now. If it crashes without forge, it can't be forge's fault. But even further, any crash in the java virtual machine isn't forge's fault. It's java's fault.

Ask the solar flux reborn mod author.

If you correctly changed the config/fml.toml file as described, you should see this message in the log you didn't post. https://github.com/MinecraftForge/MinecraftForge/blob/aa170facb7284527bb0240d847a084ea09189cbb/fmlcore/src/main/java/net/minecraftforge/fml/VersionChecker.java#L109 I am no expert on this stuff, but a lot of these connection timeout errors seem to be caused by a mismatch of your network router or firewall where it allows ipv6 on outgoing network traffic but not incoming, or vice-versa. https://forums.minecraftforge.net/topic/119545-failed-to-authenticate-error-only-on-forge/?do=findComment&comment=524664

Why are you asking for help in the forge support forums when you are not even using forge? It is a java crash, contact the author of your java implementation (in your case microsoft - support link is in what I quote above). They should be able to tell you the real cause, e.g. commonly with minecraft a bug in your graphics driver.

You removed the aoa3 mod which is part of the world generation for that save. So minecraft can't reload the save without it. Either restore the aoa3 mod or start a new world.

Player.onUpdateAbilities() On the server it sends a network packet to the client to tell it about the changes you made.

Issue with java, contact microsoft or try a different java. But maybe you have this problem? https://forums.minecraftforge.net/topic/119518-exit-code-1073740940/#comment-524102

Issue with the ModelFix mod. Check you have the latest version then contact the mod author.

Which part don't you understand? We want to see the logs/debug.log NOT the crash report (which obviously doesn't exist). There is always a debug.log unless you use a launcher like curseforge that turns it off by default. Even the latest.log in the same folder would have the error in this case, if you can't figure out how to enable it on curseforge. The EAQ at the top of the support forum and linked to in my footer tells you how to get the debug.log https://forums.minecraftforge.net/topic/89239-excessively-asked-questions-eaq/#comment-415820 There are already 16 posts on this thread and you still haven't provided the log. From that EAQ

No. Read my footer. The error message from the forced crash is useless, except to see things like what mods you have installed (something the debug.log tells us anyway). This will be my last post on this thread unless you provide the information asked for. It is just too much of a time sync if you can't follow simple instructions.

If you don't want to be ignored, don't make it difficult for people to help you or annoy them by wasting their time. I searched github for your user id and found you have one repository which is totally empty: https://github.com/jossedeposse/Errors-in-currently-selected-datapack-prevent-the-world-from-loading Your github profile shows no other activity. Please provide a direct link to the file.

CAN SOMEBODY PLEASE LOCK THIS THREAD. Otherwise necro posters are going to make the solution unfindable. It is here: https://forums.minecraftforge.net/topic/119518-exit-code-1073740940/#comment-524102 If anybody has issues with this solution they should contact the flywheel/create mod authors for help.