DaemonUmbra

Oh lord, 3 things here: You appear to be trying to use Optifine for 1.8.9 with MC 1.12.2, this will not work. You somehow have an EMPTY Optifine file suggesting you've used Firefox and it blocked the download. You are using Labymod which as far as I know is a massive coremod

Update to the latest version of Java 8. https://adoptopenjdk.net

Show the version dropdown?

Sounds like you have WinRar installed and it's insisting that Jar files belong to WinRar instead of Java. Try this: https://johann.loefflmann.net/en/software/jarfix/index.html

Please provide your installer log, it will have the same name as the installer but with .log on the end: Installer: forge-{version}-installer.jar Log: forge-{version}-installer.jar.log Note: If you have Windows Explorer set to hide file extensions(as is the default setting), they will look like this: Installer: forge-{version}-installer Log: forge-{version}-installer.jar Edit: Wait a sec, why are you installing THAT version of Forge?

You shouldn't have any need to delete it, yes it might be annoying but it won't prevent you from installing other Forge versions.

Please provide your installer log, it will have the same name as the installer but with .log on the end: Installer: forge-{version}-installer.jar Log: forge-{version}-installer.jar.log Note: If you have Windows Explorer set to hide file extensions(as is the default setting), they will look like this: Installer: forge-{version}-installer Log: forge-{version}-installer.jar

What launcher are you using? Please provide a screenshot.

It's not the right site. https://files.minecraftforge.net is the right site. Please check out the StopModReposts project (link in my signature) for more info.

Update Optifine

I told you 8 or 10, where did I tell you to use 9?

Use Java 8 or 10

Why the heck do you have a deobf version of dynamic trees?

I believe this is actually an issue in the launcher_profiles.json with the launcher interpreting the Forge profile as if it's managed/default/whatever similar to "Latest Version".

User was banned for using a cracked launcher. Buy the game.

Never seen this one before... Can you provide a screenshot of your config folder?

I've just had CatServer explained to me, we don't provide support for third party attempts to merge Forge and Bukkit/Spigot.

The filenames of one or more of your mods suggests you got them from a repost site. Please read up on the StopModReposts project (link in my signature) for info on why this is a bad thing.

Please don't Necro old threads, if you have an issue make your own.

What launcher are you using? Please provide a screenshot.

I'm not sure I even understand what you're saying. Please recreate the crash and provide your debug.log using one of the paste sites listed in my signature.

If you look at the crash log, specifically this part: and do a bit of Googling I think you might be able to find out what's wrong with the format of your config file. Hint: It's a JSON file.

You can either delete the config and let it re-generate the default or you can see where you went wrong with the formatting

1.7.10 is no longer supported on this forum due to its age. Please update to a modern version of Minecraft to receive support.

Fabric is a different modloader...