DaemonUmbra

Chances are you're running a HEAVY modpack on a cheaper (less powerful) host package.

Damage Indicators is broken.

Where are you getting your mods?

Where are you getting your mods?

MobArmorMod is broken/poorly made and will not work on servers.

Yes

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.

Where are you getting your mods?

Forge version will be in your profile options and JEI should have an update button next to it.

You run the Forge installer for the new version and select it in the launcher, then you replace the old JEI jar with the new one in your mods folder

Stop using that program. Just run the Forge Installer and set the server up yourself.

JEI has been updated to fix this issue, you should be good to update both Forge and JEI

Datt: Delete the file it says is corrupt and try again. Trew: Please do not hijack threads, if you have an issue make your own.

This has nothing to do with the crash and they have allocated 2G.

Does this happen only Forge?

I'm not sure what you mean by "too much ad", but CurseForge is where the mod authors upload their mods

Where are you getting your mods?

Please do not hijack threads, if you have an issue please make your own.

Update JEI

Did you run the installer in that folder or did you just move the installer there?

Update JEI

Please do not hijack threads, if you have an issue please make your own.

I see no crash in that log, and sadly the new launcher is ignoring Forge's logging config. Could you please close your launcher, then open it and start the pack, once the pack crashes close the launcher and check your .minecraft folder for a launcher_log.txt file and provide that.

I'm just going to count this as Twitch yet again dropping the ball. Check my signature below, (Logs Section, Twitch Launcher Sub-Section) you'll find instructions on how to run a Twitch pack without Twitch's launcher tweaks screwing with you.

What was this new website?