DaemonUmbra

I believe the Forge installer expects an empty folder when it installs a server

Can you provide your server.properties please?

Oh, rip

One does not simply move the Minecraft directory

Threads merged. We will not help you make a launcher, drop it.

Does simply adding the other mod project as a dependency not add it to the runtime?

What does this tool say? https://dinnerbone.com/minecraft/tools/status/

Crazy Craft 3 is 1.7.10 and 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.

Going to stop this here, I HATE the "Well it other people are doing it it must be ok" defense

Are these going to be shipped in the same jar?

The generated source set is one you have to create (easier than it sounds, all the defaults are correct for your usage), just look up how to create a Gradle source set

It's Twitch that would need to fix it, until they do I have instructions in my signature below for running a Twitch modpack outside of Twitch with a manually installed version of Forge

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

What launcher are you using? Please provide a screenshot.

Make sure your configs are the same as well

Try 28.1.10

Try repairing the instance, this tends to happen when Twitch has botched Forge's install process

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

Remove Liteloader, it's not a server thing

That error is coming out of the JVM, not Forge or Minecraft. Try reinstalling Java

Oh that button. If you're having the same issue as another person you may be launching vanilla under a Forge-named profile. Try modifying the profile to select the correct version of Forge as the game version

Try version 28.1.10

At least one of your mods requires a later Forge version than the recommended and they have not indicated so in their mod file, so Forge can't catch it and make a proper error screen

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. Also: You CAN have more than one Forge

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.)