DaemonUmbra

Do you know Java or are you trying to learn Java through modding?

Open the context menu of a jar and open its properties, show a screenshot of that window

I should have brought this up first... We don't support 1.12 anymore, if you want support you'll need to update to a modern version of Minecraft.

As you were already told... 1.8 is no longer supported on this forum. Making a new thread does not change the answer.

Try adding shadow.dependsOn("reobfJar")

What task are you running to build your mod?

I don't know how shadow works, only what it is meant to do. I'll look into it later and edit this post.

That's not how it works. Cheats are cheats whether you use them on 2b2t or a server that doesn't allow them.

Try adding Java to your firewall's whitelist.

Why do people feel the need to have a build.bat? Just open CMD, cd to the project directory and run gradlew build. Instead of writing off the errors as "an ocean", pass them on to us, the errors have information, they aren't just there to be annoying. Use one of the paste sites listed in the "Logs" section of my signature below to avoid a lengthy post.

Do you have permission from the author to do this?

This is starting to sound like a cheat mod, which we don't support.

Optifine on a server makes no sense as it is a mod designed for graphics, which the server is not responsible for. Therefore, on a server it just becomes another possible point of failure.

If that's a CurseForge modpack you absolutely need Twitch or Overwolf to install it. That zip isn't a mod or even an archive of mods... it's just the modpack's configs and a list of mods that Twitch or Overwsolf will read and download the mods.

Delete /world/serverconfig not defaultconfigs

What was the full path of the file you deleted?

Please cite your sources

Big fat [Citation Needed] here

If defaultconfigs is empty it just means that this isn't a pre-made modpack or the packmakers didn't make any config changes. Yes delete it.

Launching a server you would just put it somewhere before the -jar argument. Launching a client you'll need to edit the profile, show the advanced options, and put it into the JVM args there.

This crash is from the server config for curios being corrupted. Go into the world save, serverconfig folder, and delete or (if it's a modpack) restore the config from defaultconfigs.

Please cite your sources... I'm currently looking at the website of the US Copyright office and registration is not necessary to copyright something, unless you need to bring that copyright to court.

Is this outside of development? If so, your issue isn't that you're using shadow, its that your mod isn't being reobfuscated.

What mappings are you using? and why do you need the keybind, why not just do what the keybind does rather than having the keybind do it?

Pretty sure it would be protected in that case. In any case, Eloraam explicitly forbids reverse engineering or reuse of RedPower's assets (the only exception being allowing the assets to be altered for resource packs), so while you could technically make a mod that mimics it, you would need to make all new textures and prove you wrote the code without reference to the mods internals.