I am having a problem with your cataplant causing this crash. It's either just a normal zombie or an infernal mobs zombie, I am not a pro at reading crash logs so here it is. Also I have Biomes O Plenty and I get this crash on both 0.8.2. and 0.8.3. (only versions I have tried) 1.10.2, modpack is FTB Beyond and I'm sure if you want to know the rest of the mods I'm using its all in the log as well. http://pastebin.com/5R6cGqXt

Am I correct in assuming this is a dedicated server?

Yes this is a server. @Shadows-of-Fire