Logs:
https://pastebin.com/kHpevUFf

More complete log with startup of modpack:
https://gist.github.com/gatlinnewhouse/5c83605eca5a7ee31bb81bca4086301d

This may be due to other mods in the mod pack like optifine or ferritecore

Stack Overflow Error

Another log

I do some bad things that java 8 allows, but not newer versions. For now, downgrade to java 8

Thanks @cam72cam!