Crashlog: https://gist.github.com/Medowar/0f9bb534e0c71ac26f4c

Crash happened while opening the config of the DigitalMiner. Server is using Yogscast Complete Pack from the ATLauncher, newest version.

You're using a very old and no longer supported version of Mekanism, for a Minecraft version we don't develop for any more. Sorry.