Sometimes the game doesn't start and I get an error saying that the mod failed to load
This seems to happen randomly
Log: https://gist.github.com/Insane96/980d85ea27271013a9eb0ea253b22393

So unless I'm quite mistaken about the conditions under which this mod's ore replacement works, this is an issue with two mods trying to interact with vanilla ore gen at the same time (given that it happens "randomly", this smells very much like that). I can try and diagnose that, but it would massively help if you were able to identify which mod(s) are the cause of the problem.