Ugdhar

1.12 is no longer supported, you will need to update to receive support. Information on supported versions can be found here, or at the blue bar link at the top of the forum pages:

There's either a server already running, or something else running on the MC port.

I would wager a problem with rubidium, does it have a newer version maybe?

Nope, that's the changelog

It should be in the same folder as the installer, same name I believe but .log extension.

Unfortunately, 1.12 is no longer supported. More information on supported versions can be found here:

Please post your full debug.log it will have more information in it.

Please post the debug.log it will have more information in it than the crashlog.

Is that the full log? It looks like it ends early, not seeing a crash at the end like before.

Always post new logs if you make a change, and it is still broken. This will both ensure the removed mod is indeed removed, as well as provide information for why it continues to crash.

Optifine works with specific versions of forge, they show which ones on the download page. Just like any other mod author, if forge makes changes, then the mod (in this case optifine) will potentially need updating. This should be brought to the optifine developer

If I had to choose, I would choose adoptium 100%. *edit: Well, I guess I DID, since I downloaded my java from adoptium java-for-minecraft sounds like a google result that will hack your computer lol.

This error makes me think your save file is broken: Missing mod: Broken/malformed config: (looked like there were more of these) My guess is that enough changed in forge and/or the mods you're using from 1.16 -> 1.18 that your world probably won't load/run without tweaking, if at all. Possibly someone else will see this and have an idea how you can fix it, but my thoughts are you probably need to play the 1.16 world in 1.16.

This might seem like a silly question, but did you run the forge installer to install the server? If so, can you post the installer log?

Did a quick search of the forums for "PKIX path", and from what I gather in the results, there is an issue with your java installation. Uninstall it completely, then reinstall. If it still doesn't work, post the installer log please

Post the debug.log from your logs folder, it will hopefully have the information needed to figure out why.

I'd start with Oh The Biomes You'll Go

Also I do not believe 1.16 is supported any longer, I believe 1.18 is LTS and 1.19 is current

It would appear it used up all the memory allocated to it, you should give it more memory by modifying the -Xmx value

Post your debug.log, although I've heard the curseforge launcher is poo and doesn't generate one by default. I believe you can turn it back on in the MC profile settings. I don't use curseforge launcher myself, so not sure how/where it does these things. Also: You don't want/need to allocate ran to the actual curseforge launcher, you want that memory allocated for the MC process that launches. Not sure if that's what you meant or not, but figured I would clarify just to be sure

Sort of, but they do not distribute the MC code, the installer decompiles/deobfuscates/patches/reobf/recompiles the MC code. More or less, the problem here is that historically when it's done this way, mods aren't as likely to be compatible with one another as using an API like Forge. As someone above mentioned, I would use a modern version, as old versions aren't supported on here (manpower, pushing to use new stuff for features/bug fixes/security/etc). Using forge would make it easier for your mod to play well with other (Forge) mods. It is still up to the developer to make sure they're not running client-side code (i.e. models/sound/textures) on a dedicated server. https://wiki.mcjty.eu/modding/index.php?title=Main_Page might give you some useful information, especially if you're already familiar with Java. I would also suggest browsing the forge docs https://docs.minecraftforge.net/en/latest/, the getting started section will get you up and running, and it explains other things such as registries and sides. And if you run into issues, post your code to Github as a working repo (makes it easier for people to help debug), describe your problem in a support post on here, and chances are good someone will be able to help fix it.

Make sure if you're using Optifine, that you are using the version of forge it says it supports on their downloads page: https://optifine.net/downloads I would guess that using any other version but the one specified could potentially cause issues. I would say it is also worth seeing if removing optifine and running it still crashes or not.

I believe 1.19 needs a newer version of Java, https://forums.minecraftforge.net/announcement/15-java-and-you-how-to-avoid-crashes/

Well, the errors seem as though they're tconstruct/jei, have you tried updating those? There are newer versions for 1.16 on curseforge for both of those mods. If you're convinced it's one of your dimensions mods, remove them 1 by one, or remove all and add them back 1 by 1, until you find the culprit. *edit: what is tlskincape?