Ugdhar

Make sure to read the changelog for Optifine, it tells you what versions of forge it works with. There is no forge compatible version of Optifine for 1.15.2 yet.

The one forge<version>mapped_snapshot should have all the vanilla/forge code in it. There's also a client-extra.jar containing client stuff like model jsons and such.

Please start your own thread, and post your debug.log as described in the EAQ

Please post the debug log as described in the EAQ

This thread is nearly 2 years old, if you're having an issue, you should make your own thread. Also please keep this forum in english. Keep in mind also that versions below 1.14.4 are no longer supported. See the LTS link at the top of every page.

Just no longer supported anymore. If you want to use it, there's no rule against it, but if you have problems, it is no longer supported. Read the LTS link at the top of every page, it gives more information on supported versions.

Please post logs as described in the EAQ, more info is needed Also please keep in mind versions below 1.14.4 are no longer supported due to age.

Really old versions are no longer supported. Please update to a modern (1.14.4 or 1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

By downloading/installing/using a supported version of forge (and supported versions are listed in the LTS link. Read it, it's important). Long story short, 1.14.4 and 1.15.2 are supported, older versions are not. As far as I know you can still use it, but if you have problems, you will not get support on these forums.

Forge is safe, just make sure you ONLY download it from files.minecraftforge.net as anywhere else could tamper with the files, have outdated/mislabeled versions, etc. When downloading forge, *do not click on anything* after you click the download link for the file you want until the skip button appears in the top right of the download page, then click that. ONLY download mods from curseforge.com, there are a million pages that illegally host mods, and many of them have adware/spyware/viruses. Searching google for mods is dangers, because a lot of these bad bad sites have paid to get their pages put in the top results. Best way, just use curseforge.com it is safe. The issue with Pixelmon is that it is on an old version of forge that is no longer supported on these forums. If you use it and have troubles, you will have to ask for help somewhere else.

You should use Java 8 with Forge. And I do not believe you need a JDK unless you plan on developing mods, a JRE should suffice. Try running the installer from a terminal window, using java -jar <NAME OF FILE> If it fails, copy/paste the output here. If it runs, there should be an installer log file generated in the same folder as the installer, with the same name, except for .log at the end. If the installer does run, but fails during the install, post the contents of that file.

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

I believe you should be using loot tables. Here's a thread I remembered that's related: https://www.minecraftforge.net/forum/topic/74752-harvestdropsevent-not-working-as-expected/

Where are you downloading forge from?

Really old versions are no longer supported. Please update to a modern version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

I would say the only way to fix it would be to remove the mods from gottsch, or remove corail tombstone

You could try posting the latest.log, but I do not know if that would have enough information.

Ok, I would take a look at Daemonumbra's signature, under the logs section, where it says "Twitch Launcher", and perhaps try running the modpack through the vanilla launcher, and see if that makes a difference.

I honestly couldn't tell you, I've never run into this issue, hopefully someone that knows will see it and have some advice!

There is some information on rendering changes here, have you already seen it? https://gist.github.com/williewillus/30d7e3f775fe93c503bddf054ef3f93e

That's a newer log, but the errors are exactly the same, so I would say the original suggestion is still true.

1.12 is no longer supported due to age. Please update to a modern version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

None of that is the debug.log