Version Info

• Minecraft - 1.12.2
• Connected Glass - Latest 1.1.11

Try to launch server with Connected Glass, Fusion + CoreLib and it crashes.
Able to launch from client without issue (Except when optifine is present, it crashes then too).
...

crash-2024-02-12_00.02.18-server.txt

...

That is rather odd. Fusion's core plugin appears to be loaded, but the mod itself is absent.
Could you provide the latest.log file as well?

2024-02-12-1.log
2024-02-12-2.log

Broken up into two parts because thats the way it's displayed to me.

Edit: Initially uploaded .gz versions, re-uploaded just the .log

Whelp that would be why I guess. For some reason I didn't actually consider the fact that this is about a server 😅
Turns out I just marked the dependency incorrectly as it should be client-only.

It should be fixed now in Connected Glass version 1.1.11a for Minecraft 1.12.
Thank you for reporting the issue!