DaemonUmbra

Forge installs itself as a version of Minecraft. Make a new Profile/Installation and select Forge from the version dropdown. (Note: For some reason Forge 1.12.2 gets booted to the bottom of the list.)

Try following the video in my signature and running the pack without Twitch

That's not the correct log, check my signature for info on where to find the correct log.

trashslot has the same issue, need to be updated. If you get an issue without any mods please post that log.

I'll need to see logs

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

You should learn to mod 1.14.4, 1.12.2 will be Legacy once 1.14.4 gets a recommended build.

it's a method that got renamed, anything that used that method needs to be updated

Make your own thread and provide logs

Throw it all out. Start over with this.

Are you following a tutorial? Do you know Java (or any other programming language)?

Your issue is trying to load client-only code from common code, thus crashing on servers

Oh I only skimmed and missed that. You're in the wrong subforum then. Moving thread...

Solution: Don't play on that server edited

Whatever the heck hyperion is, it's poorly made and won't work on servers.

Xaero's Minimap needs to be updated due to a change in Forge, check for an updated version.

Referring you to a site that details the dangers of getting your mods from the wrong place is not self-advertisement...

Please provide debug.log

What launcher are you using? Please provide a screenshot.

Ancient Thread and 1.8.9 isn't supported on this forum anymore. Update to receive support.

It's asking for a Java Executable and you're giving it your jre folder, give it javaw instead

You need to point at javaw, not the jre folder

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.

Can you show a screenshot of the directory and a screenshot of your launcher saying it doesn't exist?

Forge 1.13+ only works with Java 8-10, you have Java 11