Modpack version
0.3.13
Describe the bug
The main server will not run it just crashes on startup.

Logs
https://pastebin.com/F2B3hS0x

Screenshots
If applicable, add screenshots to help explain your problem.

It is not in the log file but forge's server host is currently experiencing issues causing broken downloads.

This is most likely your issue too, although I would need you to run from console to see the output.

Here is a screenshot.

Yep you are missing files. Ironically the library that is responsible for logging what happens :)