warjort

"[1.19, 1.19.3)" means it wants a version matching 1.19 <= version < 1.19.3 Which 1.19.3 does not. i.e. the mod is not compatible with 1.19.3

I am no expert on reading the spark reports. You should use the spark discord. For what it's worth. I don't see anything related to what you describe. i.e. players logging in, or the server thread getting stuck for a long period time (freeze). If that profile is really representative of what is happening the problem must be elsewhere, e.g. at the networking or system level. According to the metrics, you ran that profile for 1 minute and 1 seconds. During that time it recorded a full system garbage collection taking 1600ms (1.6 seconds) and says your memory (swap) is 93% full. Both are highlighted in red. Like I said above, the spark developers would be the people to ask on how to interpret their data.

Issue with immersive portals - probably a conflict with another mod? Check you have the latest version then contact the mod author.

One of your mods has an invalid version format. The error message does not say which one. The same version id "1.0-1.19+" is probably included in the jar name?

Maybe this: https://forums.minecraftforge.net/topic/119518-exit-code-1073740940/#comment-524102 Otherwise you need to post a link to the logs/debug.log, crash report or launcher_log.txt so we can see the real cause.

The methods in Block(Behaviour) are deprecated because you are not supposed to call them directly. Instead you should use the method on the BlockState. If you are implementing/overridding the method there is no issue. There may sometimes be a better method to implement on the IForgeBlock interface.

Use java 17, mixin does not support java 19

Check you have the latest version then contact the mod author.

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.