Disabling mod on server world (Crash and problems related)

Hi,
I am having problems disabling a mod that has caused a lot of problems: Chance Cubes. Currently it causes some problems that makes the server unable to start. I would like to disable Chance Cubes, but the server is stuck at loading the world.

Crash report when loading the world:

To fix this problem I have tried:
Disabling Sponge.
Reinstalling Chance Cubes fresh from mods.curse.com
Disabling Chance Cube -> Server not loading

Is there a way to disable a mod completely from a world with the ability to start the server?
(My problem, removing the mod and config make the server unable to start)

Thank you

Caused by: java.io.IOException: Permission denied

It could be that the chance cubes’ config file is write protected? Seems like something that is not related to sponge.