Modded server not starting - no missing dependencies, couldn't save chunk

Hey guys,

I need some help. I've been trying to set up a modded 1.12.2 server, and I've done this before - i've installed all the dependencies etc., but for some reason my server keeps crashing and I don't understand the logs - something about failing to save chunks?

Here's the log -https://mclo.gs/LMHbMEj

Any help is greatly appreciated!

Thx