We have been checking recent problems with opcodes and crashes on server, and have found that the latest version of the ELM mod is causing this.
The problems are not just for the players using them, but also for the players who are near those using the WLM mod.
There for until the problems are solved, we require players not to use this, for the good of other players.
Please report this to the makers, and if they solve the prolbems the mod can be tested and possibly come back in to use again.