DaemonUmbra

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.8 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Install Java and the installer's icon should change to match the Java icon, if not, run JarFix once

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Pretty sure this is a user rather than a dev

Also make sure you only ever download Forge from https://files.minecraftforge.net

Have you tried repairing the instance?

1.10 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

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

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Make sure you only ever download Forge from https://files.minecraftforge.net

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Please provide your full debug.log, it has more info than the crash report alone

For a start, remove Ores Above Diamonds, as they seem to have a broken json. For future reference just supply the debug.log using a paste site until you're asked for more

Do you have experience in other programming languages?

Just how many resource packs do you have? Try removing Lower Shields now

I'm not entirely sure what you're talking about, do you mean the mods aren't loading?

Use Java 8, 9, or 10

Provide a new log?

Ok this one I think I know, this sounds like Gradle's Daemon (read as Background Service) has corrupted itself or is otherwise misbehaving. Run ./gradlew --stop and try again

Could you provide the full error please? There should be a bit above the actual failure notice.